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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	[1]	$ 125	$ (102)	$ 116	$ (61)
Not designated as hedging instrument
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		125	(102)	116	(61)
Not designated as hedging instrument | Futures contracts
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		86	(87)	69	(73)
Not designated as hedging instrument | Foreign currency forward contracts
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		31	(20)	32	4
Not designated as hedging instrument | Other
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	[2]	$ 8	$ 5	$ 15	$ 8

[1] See note 10 for information on the Company’s derivative instruments.

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