Derivative Financial Instruments - Net Realized Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 18	$ 48	$ (193)
Net investment income	1,949	1,858	1,689
Other net gains (losses)	168	(273)	(101)
Other Comprehensive Income (Loss) | Designated as Hedging Instrument | Cash flow hedges | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1)	1	2
Other Comprehensive Income (Loss) | Designated as Hedging Instrument | Cash flow hedges | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	33	(23)	0
Investment Income | Designated as Hedging Instrument | Cash flow hedges | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0
Investment Income | Designated as Hedging Instrument | Cash flow hedges | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	3	7	10
Net realized gains (losses) on derivatives	8	10	10
Other net gains (losses) | Fixed maturities
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(4)	0	2
Other net gains (losses) | Within products
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	31	(23)	(11)
Other net gains (losses) | Designated as Hedging Instrument | Cash flow hedges | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Net realized gains (losses) on derivatives	(5)	(3)	0
Other net gains (losses) | Not Designated as Hedging Instrument | Credit contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2	3	1
Other net gains (losses) | Not Designated as Hedging Instrument | Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(16)	51	(85)
Other net gains (losses) | Not Designated as Hedging Instrument | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	1	(2)	1
Other net gains (losses) | Not Designated as Hedging Instrument | Equity contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	1
Policyholder benefits | Embedded derivative on reinsurance
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	23	(102)
Other net gains (losses) | Managed custody guarantees
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 4	$ (4)	$ 0