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Level 4- Significant Unobservable Inputs - Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | $ 35,924 | $ 36,964
CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,311 | 3,336
Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 12,634 | 12,804
Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 11,544 | 12,485
RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,086 | 3,044
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,919 | 1,952
Significant Unobservable Inputs (Level 3) | Equity options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets (Liabilities), at Fair Value, Net |  | 1
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 33 | 69
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 515 | 520
Significant Unobservable Inputs (Level 3) | Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 16 | 17
Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,233 | $ 1,230
Significant Unobservable Inputs (Level 3) | Minimum | Equity options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate |  | 18.00%
Significant Unobservable Inputs (Level 3) | Maximum | Equity options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate |  | 22.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 21 | $ 56
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 277 | 251
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 16 | 17
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | $ 1,163 | $ 1,215
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Minimum | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 9.00% | 9.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Minimum | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 112.00% | 103.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Minimum | Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 199.00% | 192.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Minimum | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 6.00% | 24.00%
Constant prepayment rate | 1.00% | 1.00%
Constant default rate | 0.00% | 0.00%
Loss severity | 0.00% | 0.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Maximum | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 1040.00% | 1040.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Maximum | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 768.00% | 1000.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Maximum | Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 240.00% | 250.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Maximum | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 335.00% | 351.00%
Constant prepayment rate | 25.00% | 25.00%
Constant default rate | 9.00% | 9.00%
Loss severity | 100.00% | 100.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average [Member] | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 389.00% | 400.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average [Member] | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 197.00% | 242.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average [Member] | Municipal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 218.00% | 219.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average [Member] | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread | 69.00% | 74.00%
Constant prepayment rate | 7.00% | 6.00%
Constant default rate | 4.00% | 4.00%
Loss severity | 59.00% | 66.00%
Long | Significant Unobservable Inputs (Level 3) | Interest Rate Swaption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 2 | $ 1
Long | Significant Unobservable Inputs (Level 3) | Equity options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Assets (Liabilities), at Fair Value, Net | $ 1 |
Long | Significant Unobservable Inputs (Level 3) | Minimum | Interest Rate Swaption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 3.00% | 2.00%
Long | Significant Unobservable Inputs (Level 3) | Minimum | Equity options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 20.00% |
Long | Significant Unobservable Inputs (Level 3) | Maximum | Interest Rate Swaption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 3.00% | 2.00%
Long | Significant Unobservable Inputs (Level 3) | Maximum | Equity options |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 27.00% |

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