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Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 12,129 | $ 13,706
Fair Value | (61) | (66)
Asset Derivatives | 33 | 40
Liability Derivatives | (94) | (106)
Fixed maturities, available-for-sale |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 269 | 244
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 9,585 | 1,277
Fair Value | 23 | 12
Asset Derivatives | 25 | 13
Liability Derivatives | (2) | (1)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,275 | 12,185
Fair Value | (84) | (78)
Asset Derivatives | 8 | 27
Liability Derivatives | (92) | (105)
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,626 | 2,310
Fair Value | (13) | (1)
Asset Derivatives | 3 | 4
Liability Derivatives | (16) | (5)
Designated as Hedging Instrument | Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,340 | 2,040
Fair Value | 0 | 0
Asset Derivatives | 0 | 1
Liability Derivatives | 0 | (1)
Designated as Hedging Instrument | Foreign currency swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 286 | 270
Fair Value | (13) | (1)
Asset Derivatives | 3 | 3
Liability Derivatives | (16) | (4)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 9,503 | 11,396
Fair Value | (48) | (65)
Asset Derivatives | 30 | 36
Liability Derivatives | (78) | (101)
Not Designated as Hedging Instrument | Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 7,600 |
Not Designated as Hedging Instrument | Interest rate swaps and futures |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 8,335 | 9,338
Fair Value | (69) | (59)
Asset Derivatives | 4 | 3
Liability Derivatives | (73) | (62)
Not Designated as Hedging Instrument | Foreign currency swaps and forwards |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 269 | 464
Fair Value | 0 | (1)
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | (1)
Not Designated as Hedging Instrument | Credit derivatives that purchase credit protection |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 6 | 124
Fair Value | 0 | (3)
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | (3)
Not Designated as Hedging Instrument | Credit derivatives that assume credit risk |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 675 | 500
Fair Value | 21 | 13
Asset Derivatives | 21 | 13
Liability Derivatives | 0 | 0
Not Designated as Hedging Instrument | Credit derivatives in offsetting positions |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 218 | 29
Fair Value | 0 | 0
Asset Derivatives | 5 | 5
Liability Derivatives | (5) | (5)
Not Designated as Hedging Instrument | Equity index swaps and options |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 0 | 941
Fair Value | 0 | (15)
Asset Derivatives | 0 | 15
Liability Derivatives | $ 0 | $ (30)

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