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Derivative Instruments - Derivatives - Derivative Balance Sheet Classification (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 11,729 | $ 12,129
Fair Value | (33) | (61)
Asset Derivatives | 33 | 33
Liability Derivatives | (66) | (94)
Other investments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 9,657 | 9,585
Fair Value | 22 | 23
Asset Derivatives | 24 | 25
Liability Derivatives | (2) | (2)
Other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 1,803 | 2,275
Fair Value | (55) | (84)
Asset Derivatives | 9 | 8
Liability Derivatives | (64) | (92)
Available-for-sale Securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 269 | 269
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 9,092 | 9,503
Fair Value | (23) | (48)
Asset Derivatives | 30 | 30
Liability Derivatives | (53) | (78)
Interest rate swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,340 | 2,340
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Interest rate swaps | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 7,600 | 7,600
Foreign currency swaps | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 297 | 286
Fair Value | (10) | (13)
Asset Derivatives | 3 | 3
Liability Derivatives | (13) | (16)
Total cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,637 | 2,626
Fair Value | (10) | (13)
Asset Derivatives | 3 | 3
Liability Derivatives | (13) | (16)
Interest rate swaps and futures | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 7,926 | 8,335
Fair Value | (44) | (69)
Asset Derivatives | 4 | 4
Liability Derivatives | (48) | (73)
Foreign currency swaps and forwards | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 269 | 269
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Credit derivatives that purchase credit protection | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 6 | 6
Fair Value | 0 | 0
Asset Derivatives | 0 | 0
Liability Derivatives | 0 | 0
Credit derivatives that assume credit risk | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 675 | 675
Fair Value | 21 | 21
Asset Derivatives | 21 | 21
Liability Derivatives | 0 | 0
Credit derivatives in offsetting positions | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 216 | 218
Fair Value | 0 | 0
Asset Derivatives | 5 | 5
Liability Derivatives | $ (5) | $ (5)

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