Equity in Net Assets of Nonconsolidated Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Total assets	$ 132,011	$ 122,545
Total liabilities	116,468	107,535
Finance charge income	6,204	4,521	$ 4,103
Provision for loan losses	826	654	248
Income before income taxes	2,985	4,076	5,036
Net income	2,245	3,084	3,789
Undistributed earnings of foreign subsidiaries	454	390
Non-consolidated affiliates
Schedule of Equity Method Investments [Line Items]
Finance charge income	1,373	1,636	1,668
Provision for loan losses	182	172	32
Income before income taxes	525	661	774
Net income	393	494	582
Undistributed earnings of foreign subsidiaries	$ 837	$ 795
SAIC-GMAC Automotive Finance Company Limited
Schedule of Equity Method Investments [Line Items]
Ownership percentage (as a percent)	35.00%	35.00%
Dividends declared	$ 273	$ 342	309
Cash dividends received	$ 96	$ 120	$ 108
SAIC-GMF Leasing Co. Ltd.
Schedule of Equity Method Investments [Line Items]
Ownership percentage (as a percent)	35.00%	35.00%
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Finance receivables, net	$ 18,142	$ 22,011
Total assets	19,629	23,558
Debt	13,692	17,952
Total liabilities	$ 15,751	$ 19,713