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Contingencies and Other Matters - Financial Guarantees (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2015
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| Market Value Guarantee [Member] |
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| Guarantee Obligations [Line Items] |
|
| Guarantee Obligations, Maximum Exposure, Undiscounted |
$ 41,000,000 |
| Guarantee Obligations, Current Carrying Value |
8,000,000 |
| Market Value Guarantee [Member] | Expiring In 2016 [Member] |
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| Guarantee Obligations [Line Items] |
|
| Guarantee Obligations, Maximum Exposure, Undiscounted |
16,000,000 |
| Market Value Guarantee [Member] | Expiring In 2025 [Member] |
|
| Guarantee Obligations [Line Items] |
|
| Guarantee Obligations, Maximum Exposure, Undiscounted |
25,000,000 |
| Indemnification Guarantee [Member] |
|
| Guarantee Obligations [Line Items] |
|
| Guarantee Obligations, Maximum Exposure, Undiscounted |
203,000,000 |
| Guarantee Obligations, Current Carrying Value |
0 |
| Guarantee Type, Other [Member] | Retirement And Life Insurance Contracts [Member] |
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| Guarantee Obligations [Line Items] |
|
| Guarantee Obligations, Current Carrying Value |
502,000,000 |
| Separate Accounts Liability Sold Business Percent Reinsured |
14.00% |
| Guarantee Type, Other [Member] | Variable Annuity [Member] | Guaranteed Minimum Income Benefit [Member] |
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| Guarantee Obligations [Line Items] |
|
| Guarantee Obligations, Maximum Exposure, Undiscounted |
754,000,000 |
| Annuitization election period |
30 days |
| Underlying mutual fund investment values for Guaranteed Minimum Income Benefits |
$ 1,100,000,000 |