Derivative Financial Instruments - Net Gains (Losses) Relating to Derivative Instruments Designated as Cash Flow Hedges (Details) - Cash Flow Hedging - Interest Income (Expense) Net - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Amount of pre-tax net losses recognized in OCI	$ (145)	$ (454)	$ (557)	$ (177)
Amount of pre-tax net losses reclassified from OCI into net income	$ (90)	$ (81)	$ (179)	$ (146)