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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Cash flow hedges | Interest rate contracts
Cash flow hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	$ 116	$ (81)	$ 327	$ (336)
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	(49)	(60)	(94)	(96)
Net investment hedges | Foreign exchange forward contracts
Net investment hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	(38)	9	(42)	78
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)	(130)	7	(191)	41
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	$ 0	$ 0	$ 0	$ 0