Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 128,457		$ 122,268
Unamortized premiums and discounts and deferred fees and costs	2,400		2,300
Accrued interest receivable	564		514
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	103,683		98,226
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	81,691		78,252
Consumer | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	19,245		18,012
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,923		17,644
Interest-only mortgage loans	4		5
Consumer | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	322		368
Interest-only mortgage loans	18		21
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	2,747		1,962
Finance receivables, fair value	7	$ 7	7	$ 8	$ 8
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,523		1,009
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,224		953
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	24,774		24,042
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	12,174		12,229
Commercial | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	5,114		4,939
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 7,486		$ 6,874