Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 140,260	$ 135,748
Unamortized premiums and discounts and deferred fees and costs	2,300	2,300
Accrued interest receivable	813	707
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	108,343	106,610
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	85,370	83,286
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,895	19,735
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,657	19,445
Interest-only mortgage loans	2	3
Consumer | Mortgage — Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	238	290
Interest-only mortgage loans	13	17
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	4,078	3,589
Fair value, option, carrying amount, financing receivable, no allowance		3	$ 6	$ 7	$ 7
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	2,206	1,990
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,872	1,599
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	31,917	29,138
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	16,605	14,595
Commercial | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	5,936	5,389
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 9,376	$ 9,154