Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Commercial) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 132,456	$ 122,268
Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	25,736	24,042
Automotive | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	12,158	12,229
Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	8,425	6,874
Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	5,153	4,939
Total past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	10	1
Total past due | Automotive | 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 | Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	8	0
Financing receivables, 30 to 59 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	9	0
Financing receivables, 30 to 59 days past due | Automotive | 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	1	0
Financing receivables, 30 to 59 days past due | Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	8	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 | 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 | Commercial 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	1
Financing receivables, 90 or more days past due | Automotive | 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	1
Financing receivables, 90 or more days past due | Commercial 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	25,726	24,041
Current | Automotive | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	12,158	12,229
Current | Other | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	8,423	6,873
Current | Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 5,145	$ 4,939