Derivative Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Realized and unrealized gains (losses) on derivatives classified as cash flow hedges recorded in other comprehensive income (loss)	$ (533)	$ (533)	$ (114)
Fair value of derivatives under collateral agreements in a net liability position	3,500	3,500
Collateral posted by company netted against net liability position	3,000	3,000
Estimated gain to be reclassified from other comprehensive income (loss) into earnings	$ (182)
Net Investment Hedging [Member]
Derivative [Line Items]
Non-derivative debt instruments designated as net investment hedges		$ 1,200	$ 1,300