Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Commercial) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	$ 135,748	$ 122,268
Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	29,138	24,042
Automotive | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	14,595	12,229
Other | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	9,154	6,874
Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	5,389	4,939
Total past due | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	3	1
Total past due | Automotive | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Total past due | Other | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	3	1
Total past due | Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Financing receivables, 30 to 59 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Financing receivables, 30 to 59 days past due | Automotive | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Financing receivables, 30 to 59 days past due | Other | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Financing receivables, 30 to 59 days past due | Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Financing receivables, 60 to 89 days past due | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	1	0
Financing receivables, 60 to 89 days past due | Automotive | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Financing receivables, 60 to 89 days past due | Other | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	1	0
Financing receivables, 60 to 89 days past due | Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Financing receivables, 90 or more days past due | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	2	1
Financing receivables, 90 or more days past due | Automotive | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Financing receivables, 90 or more days past due | Other | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	2	1
Financing receivables, 90 or more days past due | Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	0	0
Current | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	29,135	24,041
Current | Automotive | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	14,595	12,229
Current | Other | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	9,151	6,873
Current | Commercial real estate | Commercial
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	$ 5,389	$ 4,939