Finance Receivables - Finance Receivables, net (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan losses	$ (1,928)	$ (1,886)
Total finance receivables, net	64,970	62,979
Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	7,352	6,725
Level 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	57,774	57,613
Retail Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	59,503	58,093	$ 53,397
Less: allowance for loan losses	(1,884)	(1,839)	$ (1,784)	$ (1,915)
Total finance receivables, net	57,618	56,254
Commercial Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	7,395	6,772
Less: allowance for loan losses	(44)	(47)
Total finance receivables, net	7,352	6,725
Dealer cash management balances	$ 1,200	$ 1,000