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Finance Receivables - Schedule of Finance Receivables, Net (Details) - USD ($) $ in Millions	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: allowance for loan losses	$ (2,895)		$ (2,725)
Total finance receivables, net	91,780		90,045
Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	17,955		17,297
Level 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value utilizing inputs	73,981		74,409
Retail finance receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	76,651		75,404	$ 75,857
Less: allowance for loan losses	(2,826)	$ (2,801)	(2,656)	$ (2,651)	$ (2,630)	$ (2,400)
Total finance receivables, net	73,825		72,748
Commercial finance receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	18,024		17,365
Less: allowance for loan losses	(69)		(68)
Total finance receivables, net	17,955		17,297
Dealer cash management balances	3,600		3,400
Commercial finance receivables \| Dealer Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	17,574		16,769
Commercial finance receivables \| Other Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	$ 450		$ 596