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Derivative Instruments - Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 12,063 | $ 13,706
Fair Value | (58) | (66)
Asset Derivatives | 37 | 40
Liability Derivatives | (95) | (106)
Fixed maturities, available-for-sale |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 270 | 244
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,490 | 1,277
Fair Value | 12 | 12
Asset Derivatives | 14 | 13
Liability Derivatives | (2) | (1)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 10,303 | 12,185
Fair Value | (70) | (78)
Asset Derivatives | 23 | 27
Liability Derivatives | (93) | (105)
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 9,436 | 11,396
Fair Value | (79) | (65)
Asset Derivatives | 16 | 36
Liability Derivatives | (95) | (101)
Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,340 | 2,040
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] |  |
Derivative, Notional Amount | 7,600 |
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 287 | 270
Fair Value | 21 | (1)
Asset Derivatives | 21 | 3
Liability Derivatives | 0 | (4)
Total cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,627 | 2,310
Fair Value | 21 | (1)
Asset Derivatives | 21 | 4
Liability Derivatives | 0 | (5)
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 8,333 | 9,338
Fair Value | (86) | (59)
Asset Derivatives | 4 | 3
Liability Derivatives | (90) | (62)
Foreign currency swaps and forwards | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 270 | 464
Fair Value | 0 | (1)
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | (1)
Credit derivatives that purchase credit protection | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 5 | 124
Fair Value | 0 | (3)
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | (3)
Credit derivatives that assume credit risk | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 600 | 500
Fair Value | 7 | 13
Asset Derivatives | 7 | 13
Liability Derivatives | 0 | 0
Credit derivatives in offsetting positions | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 224 | 29
Fair Value | 0 | 0
Asset Derivatives | 5 | 5
Liability Derivatives | (5) | (5)
Equity index swaps and options | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 4 | 941
Fair Value | 0 | (15)
Asset Derivatives | 0 | 15
Liability Derivatives | $ 0 | $ (30)

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