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Derivative Instruments - Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 12,629 | $ 12,730
Fair Value | (60) | (90)
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 27 | 25
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | 87 | 115
Fixed maturities, available-for-sale |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 153 | 153
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,022 | 9,957
Fair Value | 15 | 10
Asset Derivatives | 20 | 16
Liability Derivatives | (5) | (6)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 10,454 | 2,620
Fair Value | (75) | (100)
Asset Derivatives | 7 | 9
Liability Derivatives | (82) | (109)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 10,356 | 10,387
Fair Value | (48) | (77)
Asset Derivatives | 26 | 24
Liability Derivatives | (74) | (101)
Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,120 | 2,190
Fair Value | 0 | 0
Asset Derivatives | 0 | 1
Liability Derivatives | 0 | (1)
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 8,100 | 7,300
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 153 | 153
Fair Value | (12) | (13)
Asset Derivatives | 1 | 0
Liability Derivatives | (13) | (13)
Total cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,273 | 2,343
Fair Value | (12) | (13)
Asset Derivatives | 1 | 1
Liability Derivatives | (13) | (14)
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 8,849 | 7,986
Fair Value | (59) | (83)
Asset Derivatives | 5 | 7
Liability Derivatives | (64) | (90)
Foreign currency swaps and forwards | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 341 | 213
Fair Value | 0 | (1)
Asset Derivatives | 1 | 0
Liability Derivatives | (1) | (1)
Credit derivatives that purchase credit protection | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 6 | 61
Fair Value | 0 | 1
Asset Derivatives | 0 | 2
Liability Derivatives | 0 | (1)
Credit derivatives that assume credit risk | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 973 | 823
Fair Value | 10 | 3
Asset Derivatives | 12 | 3
Liability Derivatives | (2) | 0
Credit derivatives in offsetting positions | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 51 | 1,046
Fair Value | 0 | 2
Asset Derivatives | 7 | 11
Liability Derivatives | (7) | (9)
Equity index swaps and options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 136 | 258
Fair Value | 1 | 1
Asset Derivatives | 1 | 1
Liability Derivatives | $ 0 | $ 0

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