Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 125,365	$ 122,268
Unamortized premiums and discounts and deferred fees and costs	2,300	2,300
Accrued interest receivable	527	514
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	99,869	98,226
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	78,911	78,252
Consumer | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,713	18,012
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,372	17,644
Interest-only mortgage loans	5	5
Consumer | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	341	368
Interest-only mortgage loans	20	21
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	2,245	1,962
Finance receivables, fair value	7	7	$ 8	$ 8
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,209	1,009
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,036	953
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	25,496	24,042
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	13,497	12,229
Commercial | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	5,002	4,939
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 6,997	$ 6,874