Derivative Financial Instruments - Effect of derivative qualified as hedge accounting (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	$ 218	$ 32	$ 526	$ 73
Interest rate contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	176	10	328	(13)
Foreign exchange contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	0	0	(2)	(2)
Equity contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	(8)	(1)	(36)	11
Fixed maturities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	(2)	(1)	(8)	(6)
Within products(3)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	1	7	23	38
Embedded derivative on reinsurance
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	57	18	233	41
Embedded derivative on reinsurance | Level 3 | Measured at fair value on a recurring basis
Derivative Instruments, Gain (Loss) [Line Items]
Total Realized/Unrealized Gains (Losses) Included in Net income	(3)	(1)	(2)	3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0		1	0
Managed custody guarantees(3)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	(6)	(1)	(8)	3
Credit contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative, net	$ 0	$ 0	$ (4)	$ 1