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Derivative Instruments - Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 12,361 | $ 12,291
Fair Value | (60) | (61)
Asset Derivatives | 30 | 31
Liability Derivatives | (90) | (92)
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 | 1,353 | 9,864
Fair Value | 11 | 7
Asset Derivatives | 12 | 23
Liability Derivatives | (1) | (16)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 10,855 | 2,274
Fair Value | (71) | (68)
Asset Derivatives | 18 | 8
Liability Derivatives | (89) | (76)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 10,101 | 10,098
Fair Value | (57) | (56)
Asset Derivatives | 26 | 27
Liability Derivatives | (83) | (83)
Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,040 | 2,040
Fair Value | 0 | 1
Asset Derivatives | 0 | 2
Liability Derivatives | 0 | (1)
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 7,600 | 7,100
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 220 | 153
Fair Value | (3) | (6)
Asset Derivatives | 4 | 2
Liability Derivatives | (7) | (8)
Total cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,260 | 2,193
Fair Value | (3) | (5)
Asset Derivatives | 4 | 4
Liability Derivatives | (7) | (9)
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 8,338 | 8,451
Fair Value | (62) | (62)
Asset Derivatives | 3 | 8
Liability Derivatives | (65) | (70)
Foreign currency swaps and forwards | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 389 | 287
Fair Value | (2) | (1)
Asset Derivatives | 0 | 0
Liability Derivatives | (2) | (1)
Credit derivatives that purchase credit protection | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 115 | 6
Fair Value | (1) | 0
Asset Derivatives | 0 | 0
Liability Derivatives | (1) | 0
Credit derivatives that assume credit risk | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 514 | 1,102
Fair Value | 11 | 3
Asset Derivatives | 11 | 8
Liability Derivatives | 0 | (5)
Credit derivatives in offsetting positions | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 35 | 41
Fair Value | 0 | 0
Asset Derivatives | 6 | 6
Liability Derivatives | (6) | (6)
Equity index swaps and options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 710 | 211
Fair Value | (3) | 4
Asset Derivatives | 6 | 5
Liability Derivatives | $ (9) | $ (1)

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