Equity in Net Assets of Non-consolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Noncontrolling Interest [Line Items]
Finance charge income	$ 1,621	$ 1,158	$ 4,480	$ 3,230
Income before income taxes	741	911	2,278	3,301
Net income	33	44	111	148
Joint Ventures
Noncontrolling Interest [Line Items]
Finance charge income	328	391	1,071	1,266
Income before income taxes	127	168	423	564
Net income	95	$ 126	317	$ 424
Undistributed earnings	$ 906		$ 906		$ 795