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Fair Value Measurements - Significant Unobservable Inputs - Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 36,964 | $ 32,182
CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 3,336 | 2,790
Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 12,804 | 10,973
Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 12,485 | 10,297
RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 3,044 | 3,006
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 1,952 | 2,126
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 69 | 59
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 520 | 514
Significant Unobservable Inputs (Level 3) | Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 17 | 46
Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 1,230 | 1,261
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 56 | $ 42
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 9.00% | 10.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 1040.00% | 1084.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 400.00% | 405.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 251 | $ 245
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 103.00% | 122.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 1000.00% | 1302.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 242.00% | 345.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 17 | $ 46
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 192.00% | 135.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 250.00% | 286.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 219.00% | 252.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 1,215 | $ 1,260
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 24.00% | 16.00%
Constant prepayment rate | 1.00% | 0.00%
Constant default rate | 0.00% | 0.00%
Loss severity | 0.00% | 0.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 351.00% | 731.00%
Constant prepayment rate | 25.00% | 17.00%
Constant default rate | 9.00% | 11.00%
Loss severity | 100.00% | 100.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 74.00% | 193.00%
Constant prepayment rate | 6.00% | 4.00%
Constant default rate | 4.00% | 5.00%
Loss severity | 66.00% | 75.00%

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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- Definition Risk that one party to the contract will default expressed as a percentage, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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