Finance Receivables - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease to allowance for loan losses during period	$ 76
Retail Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	602	$ 714
Troubled debt restructurings	1,900	2,200
TDR's - subsequent default	17	28	$ 37
Trouble debt restructurings	219	301
Commercial Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0
Trouble debt restructurings	$ 0	$ 0