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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Amount of pre-tax net losses recognized in OCI	$ (687)	$ (688)	$ (864)	$ (1,092)
Amount of pre-tax net (losses) gains reclassified from OCI into net income	$ (94)	$ 4	$ (240)	$ 140