Derivatives (Primary Risks Managed by Derivatives) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 86,547	$ 90,680
Derivative assets	2,490	3,298
Derivative liabilities	9,172	10,444
Embedded Derivative, Fair Value of Embedded Derivative Asset	151	186
Embedded Derivative, Fair Value of Embedded Derivative Liability	7,311	8,800
Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,734	3,417
Derivative assets	262	250
Derivative liabilities	20	22
Derivatives Designated as Hedging Instruments: | Cash flow hedges: | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	150	180
Derivative assets	6	30
Derivative liabilities	0	0
Derivatives Designated as Hedging Instruments: | Cash flow hedges: | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,584	3,237
Derivative assets	256	220
Derivative liabilities	20	22
Derivatives Not Designated or Not Qualifying as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	82,813	87,263
Derivative assets	2,077	2,862
Derivative liabilities	1,841	1,622
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,770	2,595
Derivative assets	222	325
Derivative liabilities	11	17
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate caps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	5,100	5,100
Derivative assets	91	29
Derivative liabilities	17	4
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	8,380	8,050
Derivative assets	50	83
Derivative liabilities	9	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	11,839	9,808
Derivative assets	65	627
Derivative liabilities	544	109
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	993	956
Derivative assets	94	94
Derivative liabilities	22	21
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	303	288
Derivative assets	0	0
Derivative liabilities	3	4
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaps — written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,793	1,724
Derivative assets	29	39
Derivative liabilities	2	1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Credit default swaptions
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0	150
Derivative assets	0	0
Derivative liabilities	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity index options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	24,143	24,692
Derivative assets	981	1,155
Derivative liabilities	776	877
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity variance swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	281	281
Derivative assets	9	9
Derivative liabilities	1	1
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Equity total return swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	26,311	32,719
Derivative assets	536	493
Derivative liabilities	456	588
Derivatives Not Designated or Not Qualifying as Hedging Instruments: | Hybrid options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	900	900
Derivative assets	0	8
Derivative liabilities	0	0
Ceded guaranteed minimum income benefits
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Asset	151	186
Embedded Derivative, Fair Value of Embedded Derivative Liability	0	0
Direct guaranteed minimum benefits
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Asset	0	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	1,285	1,725
Assumed guaranteed minimum benefits
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Asset	0	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	350	427
Direct index-linked annuities
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Asset	0	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	5,309	6,211
Direct index-linked annuities | Assumed index-linked annuities
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Asset	0	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 367	$ 437