Finance Receivables - New Volume of TDR HFI & HFS Finance Receivables (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) account	Sep. 30, 2021 USD ($) account	Sep. 30, 2022 USD ($) account	Sep. 30, 2021 USD ($) account
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification TDR net finance receivables	$ 245	$ 105	$ 521	$ 332
Total post-modification TDR net finance receivables	$ 245	$ 105	$ 521	$ 332
Number of TDR accounts | account	29,448	12,528	63,129	40,727
Rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total post-modification TDR net finance receivables	$ 172	$ 72	$ 342	$ 228
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total post-modification TDR net finance receivables	$ 73	$ 33	$ 179	$ 104