Finance Receivables - Finance Receivables, net (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan losses	$ (1,886)	$ (1,978)
Total finance receivables, net	62,979	58,390
Retail Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables	58,093	51,288
Less: allowance for loan losses	(1,839)	(1,915)	$ (866)	$ (844)
Finance receivables, net	56,254	49,373
Commercial Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables	6,772	9,080
Less: allowance for loan losses	(47)	(63)
Finance receivables, net	6,725	9,017
Dealer cash management balances	1,000	1,400
Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	6,725	9,017
Level 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	$ 57,613	$ 51,645