Derivatives Derivatives (Derivatives Pertaining to Hedged Items) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	$ (1)	$ (13)	$ (32)
Amount of Gains (Losses) Deferred in AOCI	170	(52)	37
Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	2	(7)	(3)
Amount of Gains (Losses) Deferred in AOCI	0	0	0
Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	(3)	(6)	(29)
Amount of Gains (Losses) Deferred in AOCI	170	(52)	37
Net Derivative Gains (Losses)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(2,358)	(119)	(2,014)
Net Derivative Gains (Losses) | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(2,367)	(134)	(2,070)
Net Derivative Gains (Losses) | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	9	15	56
Net Investment Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	37	39	34
Net Investment Income | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Net Investment Income | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	37	39	34
Interest rate derivatives | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	0	0	0
Amount of Gains (Losses) Deferred in AOCI	0	0	0
Interest rate derivatives | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	0	0	0
Amount of Gains (Losses) Deferred in AOCI	(20)	77	25
Interest rate derivatives | Net Derivative Gains (Losses) | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(717)	3,557	1,589
Interest rate derivatives | Net Derivative Gains (Losses) | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2	2	31
Interest rate derivatives | Net Investment Income | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Interest rate derivatives | Net Investment Income | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	3	3	2
Foreign currency exchange rate derivatives | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	2	(7)	(3)
Amount of Gains (Losses) Deferred in AOCI	0	0	0
Foreign currency exchange rate derivatives | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	(3)	(6)	(29)
Amount of Gains (Losses) Deferred in AOCI	190	(129)	12
Foreign currency exchange rate derivatives | Net Derivative Gains (Losses) | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	48	(17)	22
Foreign currency exchange rate derivatives | Net Derivative Gains (Losses) | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	7	13	25
Foreign currency exchange rate derivatives | Net Investment Income | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Foreign currency exchange rate derivatives | Net Investment Income | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	34	36	32
Credit derivatives | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	0	0	0
Amount of Gains (Losses) Deferred in AOCI	0	0	0
Credit derivatives | Net Derivative Gains (Losses) | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	17	18	44
Credit derivatives | Net Investment Income | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Equity market derivatives | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	0	0	0
Amount of Gains (Losses) Deferred in AOCI	0	0	0
Equity market derivatives | Net Derivative Gains (Losses) | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(486)	(1,367)	(2,476)
Equity market derivatives | Net Investment Income | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Embedded derivatives | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivative Gains (Losses) Recognized for Hedged Items	0	0	0
Amount of Gains (Losses) Deferred in AOCI	0	0	0
Embedded derivatives | Net Derivative Gains (Losses) | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1,229)	(2,325)	(1,249)
Embedded derivatives | Net Investment Income | Derivatives Not Designated or Not Qualifying as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 0	$ 0	$ 0