Derivative Instruments - Summary of net realized gains (losses) recorded in the consolidated statements of income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	[1]	$ (102)	$ (48)	$ (61)	$ (118)
Not designated as hedging instrument
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		(102)	(48)	(61)	(118)
Not designated as hedging instrument | Futures contracts
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		(87)	(26)	(73)	(112)
Not designated as hedging instrument | Foreign currency forward contracts
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		(20)	(18)	4	(46)
Not designated as hedging instrument | Other
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	[2]	$ 5	$ (4)	$ 8	$ 40

[1] See note 9 for information on the Company’s derivative instruments.

[2] Includes realized gains and losses on swaps, options and other derivatives contracts