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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Cash flow hedges | Interest rate contracts
Cash flow hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	$ (81)	$ (345)	$ (336)	$ (194)
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	(60)	(8)	(96)	(14)
Net investment hedges | Foreign exchange forward contracts
Net investment hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	9	(6)	78	(9)
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)	7	1	41	(17)
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	$ 0	$ 0	$ 0	$ 0