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Fair Value Measurements and Disclosures (Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
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Mar. 31, 2015
|
Dec. 31, 2014
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Mortgage loans held for sale, fair value |
$ 180 |
$ 122 |
| Fair Value, Measurements, Recurring [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
2,663 |
3,847 |
| Mortgage loans held for sale, fair value |
180 |
122 |
| Derivative financial instruments, assets, fair value |
57 |
43 |
| Derivative financial instruments, liabilities, fair value |
55 |
23 |
| Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
14 |
7 |
| Fair Value, Measurements, Recurring [Member] | Forward Delivery Contracts [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
4 |
1 |
| Derivative financial instruments, liabilities, fair value |
5 |
3 |
| Fair Value, Measurements, Recurring [Member] | Other Derivative Financial Instruments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
39 |
35 |
| Derivative financial instruments, liabilities, fair value |
50 |
20 |
| Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
607 |
1,329 |
| Fair Value, Measurements, Recurring [Member] | U.S. Government Agency Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
628 |
1,033 |
| Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities - Agency [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
1,428 |
1,485 |
| Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
1,235 |
2,362 |
| Mortgage loans held for sale, fair value |
0 |
0 |
| Derivative financial instruments, assets, fair value |
0 |
0 |
| Derivative financial instruments, liabilities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Lock Commitments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Forward Delivery Contracts [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
0 |
0 |
| Derivative financial instruments, liabilities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other Derivative Financial Instruments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
0 |
0 |
| Derivative financial instruments, liabilities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
607 |
1,329 |
| Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government Agency Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
628 |
1,033 |
| Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities - Agency [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
1,428 |
1,485 |
| Mortgage loans held for sale, fair value |
180 |
122 |
| Derivative financial instruments, assets, fair value |
43 |
36 |
| Derivative financial instruments, liabilities, fair value |
55 |
23 |
| Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Lock Commitments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Forward Delivery Contracts [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
4 |
1 |
| Derivative financial instruments, liabilities, fair value |
5 |
3 |
| Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Derivative Financial Instruments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
39 |
35 |
| Derivative financial instruments, liabilities, fair value |
50 |
20 |
| Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government Agency Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities - Agency [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
1,428 |
1,485 |
| Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
0 |
0 |
| Mortgage loans held for sale, fair value |
0 |
0 |
| Derivative financial instruments, assets, fair value |
14 |
7 |
| Derivative financial instruments, liabilities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Lock Commitments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
14 |
7 |
| Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Forward Delivery Contracts [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
0 |
0 |
| Derivative financial instruments, liabilities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Derivative Financial Instruments [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Derivative financial instruments, assets, fair value |
0 |
0 |
| Derivative financial instruments, liabilities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Treasury Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government Agency Securities [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
0 |
0 |
| Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities - Agency [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale investment securities, fair value |
$ 0 |
$ 0 |