Finance Receivables - Finance Receivables, net (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan losses	$ (2,258)		$ (2,096)
Total finance receivables, net	81,650		74,514
Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	12,170		11,254
Level 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	68,690		62,150
Retail finance receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	71,704		65,322	$ 63,461
Less: allowance for loan losses	(2,224)	$ (2,166)	(2,062)	$ (2,044)	$ (1,987)	$ (1,839)
Total finance receivables, net	69,480		63,260
Commercial finance receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net of fees	12,204		11,288
Less: allowance for loan losses	(34)		(34)
Total finance receivables, net	12,170		11,254
Dealer cash management balances	$ 2,400		$ 1,900