Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 138,449		$ 135,748
Unamortized premiums and discounts and deferred fees and costs	2,300		2,300
Accrued interest receivable	763		707
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	107,370		106,610
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	84,294		83,286
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	19,149		19,735
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,894		19,445
Interest-only mortgage loans	2		3
Consumer | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	255		290
Interest-only mortgage loans	15		17
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	3,927		3,589
Fair value, option, carrying amount, financing receivable, no allowance		$ 2	3	$ 7	$ 7	$ 7
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	2,170		1,990
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,757		1,599
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	31,079		29,138
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	16,293		14,595
Commercial | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	5,662		5,389
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 9,124		$ 9,154