Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 139,439	$ 135,748
Unamortized premiums and discounts and deferred fees and costs	2,300	2,300
Accrued interest receivable	853	707
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	104,977	106,610
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	84,320	83,286
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,667	19,735
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,442	19,445
Interest-only mortgage loans	2	3
Consumer | Mortgage — Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	225	290
Interest-only mortgage loans	13	17
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,990	3,589
Fair value, option, carrying amount, financing receivable, no allowance		3	$ 7
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	0	1,990
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,990	1,599
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	34,462	29,138
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,700	14,595
Commercial | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	6,050	5,389
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 9,712	$ 9,154