Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Commercial) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 122,268	$ 118,534
Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	24,042	29,332
Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	12,229	19,082
Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	6,874	5,242
Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	4,939	5,008
Total past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	1	2
Total past due | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Total past due | Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	1	0
Total past due | Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	2
Financing receivables, 30 to 59 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 30 to 59 days past due | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 30 to 59 days past due | Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 30 to 59 days past due | Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 60 to 89 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 60 to 89 days past due | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 60 to 89 days past due | Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 60 to 89 days past due | Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 90 or more days past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	1	2
Financing receivables, 90 or more days past due | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Financing receivables, 90 or more days past due | Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	1	0
Financing receivables, 90 or more days past due | Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	2
Current | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	24,041	29,330
Current | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	12,229	19,082
Current | Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	6,873	5,242
Current | Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 4,939	$ 5,006