Finance Receivables and Allowance for Credit Losses Allowance for credit losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 760	$ 984	$ 760	$ 984	$ 763	$ 925	$ 1,061	$ 1,305
Finance receivables, net	92,994		92,994			92,350
Financing Receivable, Allowance for Credit Loss, Writeoff	(73)	(60)	(197)	(215)
Financing Receivable, Allowance for Credit Loss, Recovery	40	51	129	164
Financing Receivable, Credit Loss, Expense (Reversal)	39	(59)	(81)	(265)
Financing Receivable, Allowance for Credit Losses, Other	(9)	(9)	(16)	(5)
Financing Receivable, before Allowance for Credit Loss	93,754		93,754			93,275
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 3		$ 165
Financing Receivable, Threshold Period Past Due, Writeoff	120 days		120 days
Commercial Portfolio Segment [Member]
Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 9	37	$ 9	37	9	22	39	60
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(2)	(1)	(5)
Financing Receivable, Allowance for Credit Loss, Recovery	1	1	3	6
Financing Receivable, Credit Loss, Expense (Reversal)	(1)	(1)	(14)	(23)
Financing Receivable, Allowance for Credit Losses, Other	0	0	(1)	(1)
Financing Receivable, before Allowance for Credit Loss	25,256		25,256			19,730
Consumer Portfolio Segment [Member]
Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	751	947	751	947	$ 754	903	$ 1,022	$ 1,245
Financing Receivable, Allowance for Credit Loss, Writeoff	(73)	(58)	(196)	(210)
Financing Receivable, Allowance for Credit Loss, Recovery	39	50	126	158
Financing Receivable, Credit Loss, Expense (Reversal)	40	(58)	(67)	(242)
Financing Receivable, Allowance for Credit Losses, Other	(9)	$ (9)	(15)	$ (4)
Financing Receivable, before Allowance for Credit Loss	68,498		68,498			73,545
Retail Installment loans, dealer financing, and other financing [Member]
Allowance for Credit Losses [Line Items]
Finance receivables, net	$ 87,083		$ 87,083			$ 85,347