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Derivative Instruments - Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 11,764 | $ 12,730
Fair Value | (47) | (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 | 74 | 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 | 9,377 | 9,957
Fair Value | 14 | 10
Asset Derivatives | 19 | 16
Liability Derivatives | (5) | (6)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,234 | 2,620
Fair Value | (61) | (100)
Asset Derivatives | 8 | 9
Liability Derivatives | (69) | (109)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 9,531 | 10,387
Fair Value | (36) | (77)
Asset Derivatives | 26 | 24
Liability Derivatives | (62) | (101)
Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,080 | 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 | 7,100 | 7,300
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 153 | 153
Fair Value | (11) | (13)
Asset Derivatives | 1 | 0
Liability Derivatives | (12) | (13)
Total cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,233 | 2,343
Fair Value | (11) | (13)
Asset Derivatives | 1 | 1
Liability Derivatives | (12) | (14)
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 8,111 | 7,986
Fair Value | (51) | (83)
Asset Derivatives | 3 | 7
Liability Derivatives | (54) | (90)
Foreign currency swaps and forwards | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 318 | 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 | 8 | 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 | 923 | 823
Fair Value | 14 | 3
Asset Derivatives | 15 | 3
Liability Derivatives | (1) | 0
Credit derivatives in offsetting positions | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 46 | 1,046
Fair Value | 0 | 2
Asset Derivatives | 6 | 11
Liability Derivatives | (6) | (9)
Equity index swaps and options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 125 | 258
Fair Value | 1 | 1
Asset Derivatives | 1 | 1
Liability Derivatives | $ 0 | $ 0

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