Derivative Instruments and Hedging Activities - Schedule of Statement of Gains and Losses on Derivative Instruments Reported in Statement of Comprehensive Income (Details) - Total derivatives not designated as accounting hedges - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Total gain recognized in earnings	$ 1	$ 6
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total gain recognized in earnings	1	5
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total gain recognized in earnings	0	1
Gain on mortgage and automotive loans, net | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total gain recognized in earnings	1	5
Other operating expenses | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total gain recognized in earnings	$ 0	$ 1