Derivative Instruments - Effective Portion of Gains (Losses) Recognized in Other Comprehensive Income (Loss) and Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings (Details) - Asset and Liability Management Positions - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Cash flow hedges | Interest rate contracts
Cash flow hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	$ 342	$ (259)	$ 6	$ (453)
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	(57)	(20)	(153)	(34)
Net investment hedges | Foreign exchange forward contracts
Net investment hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	(19)	15	59	6
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	0	0	0	0
Net investment hedges | Non-derivative debt instruments
Net investment hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	(56)	24	(15)	7
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	$ 0	$ 0	$ 0	$ 0