Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 132,456		$ 122,268
Unamortized premiums and discounts and deferred fees and costs	2,300		2,300
Accrued interest receivable	620		514
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	106,720		98,226
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	83,459		78,252
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	20,021		18,012
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	19,715		17,644
Interest-only mortgage loans	4		5
Consumer | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	306		368
Interest-only mortgage loans	17		21
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	3,240		1,962
Fair value, option, carrying amount, financing receivable, no allowance	6	$ 7	7	$ 8	$ 8	$ 8
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,813		1,009
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,427		953
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	25,736		24,042
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	12,158		12,229
Commercial | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	5,153		4,939
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 8,425		$ 6,874