Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 122,268	$ 118,534
Unamortized premiums and discounts and deferred fees and costs	2,300	2,000
Accrued interest receivable	514	587
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	98,226	89,202
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	78,252	73,668
Consumer | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	18,012	15,127
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	17,644	14,632
Interest-only mortgage loans	5	8
Consumer | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	368	495
Interest-only mortgage loans	21	30
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,962	407
Finance receivables, fair value	7	8	$ 11
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,009	407
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	953	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	24,042	29,332
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	12,229	19,082
Commercial | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	4,939	5,008
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 6,874	$ 5,242