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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Amount of pre-tax net losses recognized in OCI	$ (171)	$ (1,006)	$ (185)
Amount of pre-tax net (losses) gains reclassified from OCI into net income	$ (334)	$ 99	$ 293