Derivatives (Primary Risks Managed by Derivatives) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 90,680	$ 92,544
Derivative assets	3,298	3,852
Derivative liabilities	10,444	9,608
Embedded Derivative, Fair Value of Embedded Derivative Asset	186	283
Embedded Derivative, Fair Value of Embedded Derivative Liability	8,800	7,584
Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,417	3,040
Derivative assets	250	188
Derivative liabilities	22	112
Derivatives Designated as Hedging Instruments: | Cash flow hedges: | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	180	290
Derivative assets	30	66
Derivative liabilities	0	0
Derivatives Designated as Hedging Instruments: | Cash flow hedges: | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	3,237	2,750
Derivative assets	220	122
Derivative liabilities	22	112
Derivatives Not Designated or Qualifying as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	87,263	89,504
Derivative assets	2,862	3,381
Derivative liabilities	1,622	1,912
Derivatives Not Designated or Qualifying as Hedging Instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,595	2,295
Derivative assets	325	463
Derivative liabilities	17	0
Derivatives Not Designated or Qualifying as Hedging Instruments: | Interest rate caps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	5,100	2,350
Derivative assets	29	2
Derivative liabilities	4	0
Derivatives Not Designated or Qualifying as Hedging Instruments: | Interest rate options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	8,050	25,980
Derivative assets	83	712
Derivative liabilities	0	122
Derivatives Not Designated or Qualifying as Hedging Instruments: | Interest rate forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,808	8,086
Derivative assets	627	851
Derivative liabilities	109	78
Derivatives Not Designated or Qualifying as Hedging Instruments: | Foreign currency swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	956	989
Derivative assets	94	85
Derivative liabilities	21	32
Derivatives Not Designated or Qualifying as Hedging Instruments: | Foreign currency forwards
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	288	201
Derivative assets	0	0
Derivative liabilities	4	0
Derivatives Not Designated or Qualifying as Hedging Instruments: | Credit default swaps — purchased
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0	18
Derivative assets	0	0
Derivative liabilities	0	0
Derivatives Not Designated or Qualifying as Hedging Instruments: | Credit default swaps — written
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,724	1,755
Derivative assets	39	41
Derivative liabilities	1	0
Derivatives Not Designated or Qualifying as Hedging Instruments: | Credit default swaptions
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	150	100
Derivative assets	0	0
Derivative liabilities	0	0
Derivatives Not Designated or Qualifying as Hedging Instruments: | Equity index options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	24,692	30,976
Derivative assets	1,155	1,071
Derivative liabilities	877	838
Derivatives Not Designated or Qualifying as Hedging Instruments: | Equity variance swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	281	1,098
Derivative assets	9	13
Derivative liabilities	1	20
Derivatives Not Designated or Qualifying as Hedging Instruments: | Equity total return swaps
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	32,719	15,056
Derivative assets	493	143
Derivative liabilities	588	822
Derivatives Not Designated or Qualifying as Hedging Instruments: | Hybrid options
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	900	600
Derivative assets	8	0
Derivative liabilities	0	0
Ceded guaranteed minimum income benefits
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value of Embedded Derivative Asset	186	283
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	1,725	2,751
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	427	596
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	6,211	3,855
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	$ 437	$ 382