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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Cash flow hedges | Interest rate contracts
Cash flow hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	$ (4)	$ 342	$ 323	$ 6
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	(49)	(57)	(143)	(153)
Net investment hedges | Foreign exchange forward contracts
Net investment hedges
Gains (Losses) Recognized in Other Comprehensive Income (Loss)	14	(19)	(28)	59
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)	(3)	(56)	(194)	(15)
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) into Earnings	$ 0	$ 0	$ 0	$ 0