Finance Receivables and Allowance for Credit Losses Allowance for credit losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 870	$ 845	$ 845	$ 925
Finance receivables, net	102,770		100,513
Financing Receivable, Allowance for Credit Loss, Writeoff	(96)	(62)
Financing Receivable, Allowance for Credit Loss, Recovery	39	44
Financing Receivable, Credit Loss, Expense (Reversal)	77	(64)
Financing Receivable, Allowance for Credit Losses, Other	5	2
Financing Receivable, before Allowance for Credit Loss	103,640		101,358
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 25
Financing Receivable, Threshold Period Past Due, Writeoff	120 days
Commercial Portfolio Segment [Member]
Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 7	19	7	22
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	1	1
Financing Receivable, Credit Loss, Expense (Reversal)	(1)	(5)
Financing Receivable, Allowance for Credit Losses, Other	0	1
Financing Receivable, before Allowance for Credit Loss	30,730		29,855
Consumer Portfolio Segment [Member]
Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Loss	863	826	838	$ 903
Financing Receivable, Allowance for Credit Loss, Writeoff	(96)	(62)
Financing Receivable, Allowance for Credit Loss, Recovery	38	43
Financing Receivable, Credit Loss, Expense (Reversal)	78	(59)
Financing Receivable, Allowance for Credit Losses, Other	5	$ 1
Financing Receivable, before Allowance for Credit Loss	72,910		71,503
Retail Installment loans, dealer financing, and other financing [Member]
Allowance for Credit Losses [Line Items]
Finance receivables, net	$ 96,148		$ 94,090