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Loan Receivables (Narrative) (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2015
segment
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Mar. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Number of loan portfolio segments (in segments) |
3 |
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| Private student loan forbearance lifetime cap (in months) |
12 months |
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| Private student loans including PCI in forbearance |
$ 54,000,000 |
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$ 49,000,000 |
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| Private student loans in forbearance as a percentage of student loans in repayment and forbearance (in percent) |
0.90% |
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0.80% |
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| Percentage of defaulted loans that were charged off at the end of the month in which they defaulted (in percent) |
43.00% |
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34.00% |
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| Provision for loan losses on PCI loans |
390,000,000 |
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272,000,000 |
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| Allowance for loan losses on PCI loans |
1,776,000,000 |
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1,591,000,000 |
1,746,000,000 |
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1,648,000,000 |
| Private Student Loans [Member] |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Maximum period of payment reduction for the temporary reduced payment program (in months) |
12 months |
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| Maximum forbearance period for student loan borrowers (in months) |
12 months |
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| Period triggering TDR accounting for the temporary reduced payment program (in months) |
12 months |
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| Personal Loans [Member] |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Maximum period of payment reduction for the temporary reduced payment program (in months) |
12 months |
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| Maximum repayment term for temporary modification programs (in years) |
9 years |
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| Maximum repayment term for permanent modification programs (in years) |
9 years |
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| Purchased Credit-Impaired Loans [Member] |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Purchased credit-impaired loans outstanding balance |
3,800,000,000 |
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3,900,000,000 |
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| Purchased credit-impaired loans |
3,519,000,000 |
[1] |
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3,660,000,000 |
[1] |
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| Provision for loan losses on PCI loans |
0 |
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0 |
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| Allowance for loan losses on PCI loans |
28,000,000 |
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28,000,000 |
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| 30 days or more delinquency rate on PCI student loans (in percent) |
2.15% |
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2.35% |
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| 90 days or more delinquency rate on PCI student loans (in percent) |
0.70% |
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0.75% |
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| Net charge-off rate on PCI student loans (in percent) |
0.50% |
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0.75% |
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| Credit Card Receivable [Member] |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] |
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| Maximum period of payment reduction for the temporary reduced payment program (in months) |
12 months |
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| Permanent workout program maturity (in months) |
60 months |
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| Interest and fees forgiven due to credit card loan modification program |
11,000,000 |
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10,000,000 |
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| Provision for loan losses on PCI loans |
337,000,000 |
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230,000,000 |
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| Allowance for loan losses on PCI loans |
$ 1,492,000,000 |
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$ 1,342,000,000 |
$ 1,474,000,000 |
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$ 1,406,000,000 |
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