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Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 13,706 | $ 12,291
Fair Value | (66) | (61)
Asset Derivatives | 40 | 31
Liability Derivatives | (106) | (92)
Fixed maturities, available-for-sale |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 244 | 153
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,277 | 9,864
Fair Value | 12 | 7
Asset Derivatives | 13 | 23
Liability Derivatives | (1) | (16)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 12,185 | 2,274
Fair Value | (78) | (68)
Asset Derivatives | 27 | 8
Liability Derivatives | (105) | (76)
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,310 | 2,193
Fair Value | (1) | (5)
Asset Derivatives | 4 | 4
Liability Derivatives | (5) | (9)
Designated as Hedging Instrument | Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,040 | 2,040
Fair Value | 0 | 1
Asset Derivatives | 1 | 2
Liability Derivatives | (1) | (1)
Designated as Hedging Instrument | Foreign currency swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 270 | 153
Fair Value | (1) | (6)
Asset Derivatives | 3 | 2
Liability Derivatives | (4) | (8)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 11,396 | 10,098
Fair Value | (65) | (56)
Asset Derivatives | 36 | 27
Liability Derivatives | (101) | (83)
Not Designated as Hedging Instrument | Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 7,600 | 7,100
Not Designated as Hedging Instrument | Interest rate swaps and futures |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 9,338 | 8,451
Fair Value | (59) | (62)
Asset Derivatives | 3 | 8
Liability Derivatives | (62) | (70)
Not Designated as Hedging Instrument | Foreign currency swaps and forwards |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 464 | 287
Fair Value | (1) | (1)
Asset Derivatives | 0 | 0
Liability Derivatives | (1) | (1)
Not Designated as Hedging Instrument | Credit derivatives that purchase credit protection |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 124 | 6
Fair Value | (3) | 0
Asset Derivatives | 0 | 0
Liability Derivatives | (3) | 0
Not Designated as Hedging Instrument | Credit derivatives that assume credit risk |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 500 | 1,102
Fair Value | 13 | 3
Asset Derivatives | 13 | 8
Liability Derivatives | 0 | (5)
Not Designated as Hedging Instrument | Credit derivatives in offsetting positions |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 29 | 41
Fair Value | 0 | 0
Asset Derivatives | 5 | 6
Liability Derivatives | (5) | (6)
Not Designated as Hedging Instrument | Equity index swaps and options |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 941 | 211
Fair Value | (15) | 4
Asset Derivatives | 15 | 5
Liability Derivatives | $ (30) | $ (1)

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