Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Commercial) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 128,457	$ 122,268
Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	24,774	24,042
Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	12,174	12,229
Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	7,486	6,874
Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	5,114	4,939
Total past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	2	1
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	2	1
Total past due | Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
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	2	1
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	2	1
Financing receivables, 90 or more days past due | Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	0	0
Current | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	24,772	24,041
Current | Automotive loan | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	12,174	12,229
Current | Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	7,484	6,873
Current | Mortgage/Real Estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 5,114	$ 4,939