Finance Receivables - Finance Receivables, net (Details) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan losses	$ (2,027)		$ (1,886)
Total finance receivables, net	66,847		62,979
Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	7,626		6,725
Level 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	58,528		57,613
Retail Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	61,208		58,093	$ 56,357
Less: allowance for loan losses	(1,987)	$ (1,884)	(1,839)	$ (1,805)	$ (1,784)	$ (1,915)
Total finance receivables, net	59,220		56,254
Commercial Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	7,666		6,772
Less: allowance for loan losses	(40)		(47)
Total finance receivables, net	7,626		6,725
Dealer cash management balances	$ 1,300		$ 1,000