Finance Receivables and Loans, Net (Loan Modifications) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) loan
Financing Receivable, Troubled Debt Restructuring
Total	$ 131
Percentage of total	0.10%
Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	$ 62
Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	23
Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	2
Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	3
Combination
Financing Receivable, Troubled Debt Restructuring
Total	41
Consumer
Financing Receivable, Troubled Debt Restructuring
Total	62
Consumer | Current
Financing Receivable, Troubled Debt Restructuring
Total	53
Consumer | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	4
Consumer | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	3
Consumer | Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	16
Consumer | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	3
Consumer | Combination
Financing Receivable, Troubled Debt Restructuring
Total	41
Consumer | Automotive
Financing Receivable, Troubled Debt Restructuring
Total	$ 55
Number of loans redefualted | loan	12
Amortized cost of loans redefaulted	$ 1
Consumer | Automotive | Current
Financing Receivable, Troubled Debt Restructuring
Total	50
Consumer | Automotive | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	3
Consumer | Automotive | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Automotive | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Automotive | Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Number of months extended/deferred	26 months
Consumer | Automotive | Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	$ 14
Consumer | Automotive | Contractual maturity extensions | Current
Financing Receivable, Troubled Debt Restructuring
Total	13
Consumer | Automotive | Contractual maturity extensions | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	1
Consumer | Automotive | Contractual maturity extensions | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Automotive | Contractual maturity extensions | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Automotive | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	2
Principal forgiveness, amount forgiven	1
Consumer | Automotive | Principal forgiveness | Current
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Automotive | Principal forgiveness | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Automotive | Principal forgiveness | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Automotive | Principal forgiveness | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Automotive | Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%
Consumer | Automotive | Combination
Financing Receivable, Troubled Debt Restructuring
Total	$ 39
Interest rate concessions, initial rate	10.40%
Interest rate concessions, revised rate	9.70%
Payment extensions, initial term	74 months
Payment extensions, revised term	85 months
Consumer | Automotive | Combination | Current
Financing Receivable, Troubled Debt Restructuring
Total	$ 37
Consumer | Automotive | Combination | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Automotive | Combination | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Automotive | Combination | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Consumer mortgage
Financing Receivable, Troubled Debt Restructuring
Total	4
Consumer | Consumer mortgage | Current
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Consumer mortgage | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Consumer mortgage | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Consumer mortgage | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Consumer mortgage | Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Number of months extended/deferred	159 months
Consumer | Consumer mortgage | Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	$ 2
Consumer | Consumer mortgage | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	0
Principal forgiveness, amount forgiven	0
Consumer | Consumer mortgage | Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%
Consumer | Consumer mortgage | Combination
Financing Receivable, Troubled Debt Restructuring
Total	$ 2
Interest rate concessions, initial rate	4.90%
Interest rate concessions, revised rate	3.90%
Payment extensions, initial term	314 months
Payment extensions, revised term	467 months
Consumer | Mortgage Finance
Financing Receivable, Troubled Debt Restructuring
Total	$ 4
Consumer | Mortgage Finance | Current
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Mortgage Finance | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Mortgage Finance | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Mortgage Finance | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Mortgage Finance | Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Number of months extended/deferred	159 months
Consumer | Mortgage Finance | Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	$ 2
Consumer | Mortgage Finance | Contractual maturity extensions | Current
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Mortgage Finance | Contractual maturity extensions | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Mortgage Finance | Contractual maturity extensions | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Mortgage Finance | Contractual maturity extensions | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Mortgage Finance | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	0
Principal forgiveness, amount forgiven	0
Consumer | Mortgage Finance | Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%
Consumer | Mortgage Finance | Combination
Financing Receivable, Troubled Debt Restructuring
Total	$ 2
Interest rate concessions, initial rate	4.90%
Interest rate concessions, revised rate	3.90%
Payment extensions, initial term	314 months
Payment extensions, revised term	467 months
Consumer | Mortgage Finance | Combination | Current
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Consumer | Mortgage Finance | Combination | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Mortgage Finance | Combination | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	2
Consumer | Mortgage Finance | Combination | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Other
Financing Receivable, Troubled Debt Restructuring
Total	3
Consumer | Other | Current
Financing Receivable, Troubled Debt Restructuring
Total	1
Consumer | Other | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	1
Consumer | Other | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Other | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	1
Consumer | Other | Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Other | Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Other | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	0
Principal forgiveness, amount forgiven	0
Consumer | Other | Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	$ 3
Interest rate concessions, initial rate	29.60%
Interest rate concessions, revised rate	10.60%
Consumer | Other | Combination
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%
Consumer | Credit Card
Financing Receivable, Troubled Debt Restructuring
Total	$ 3
Consumer | Credit Card | Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Credit Card | Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Credit Card | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	0
Principal forgiveness, amount forgiven	0
Consumer | Credit Card | Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	$ 3
Interest rate concessions, initial rate	29.60%
Interest rate concessions, revised rate	10.60%
Consumer | Credit Card | Interest rate concessions | Current
Financing Receivable, Troubled Debt Restructuring
Total	$ 1
Consumer | Credit Card | Interest rate concessions | 30–59 days past due
Financing Receivable, Troubled Debt Restructuring
Total	1
Consumer | Credit Card | Interest rate concessions | 60–89 days past due
Financing Receivable, Troubled Debt Restructuring
Total	0
Consumer | Credit Card | Interest rate concessions | 90 or more days past due
Financing Receivable, Troubled Debt Restructuring
Total	1
Consumer | Credit Card | Combination
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%
Commercial
Financing Receivable, Troubled Debt Restructuring
Total	$ 69
Commercial | Special mention
Financing Receivable, Troubled Debt Restructuring
Total	7
Commercial | Substandard
Financing Receivable, Troubled Debt Restructuring
Total	34
Commercial | Doubtful
Financing Receivable, Troubled Debt Restructuring
Total	28
Commercial | Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	$ 62
Number of months extended/deferred	12 months
Commercial | Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	$ 7
Commercial | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	0
Principal forgiveness, amount forgiven	0
Commercial | Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%
Commercial | Combination
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%
Commercial | Other
Financing Receivable, Troubled Debt Restructuring
Total	$ 69
Commercial | Other | Payment deferrals
Financing Receivable, Troubled Debt Restructuring
Total	$ 62
Number of months extended/deferred	12 months
Commercial | Other | Payment deferrals | Special mention
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Commercial | Other | Payment deferrals | Substandard
Financing Receivable, Troubled Debt Restructuring
Total	34
Commercial | Other | Payment deferrals | Doubtful
Financing Receivable, Troubled Debt Restructuring
Total	28
Commercial | Other | Contractual maturity extensions
Financing Receivable, Troubled Debt Restructuring
Total	7
Commercial | Other | Contractual maturity extensions | Special mention
Financing Receivable, Troubled Debt Restructuring
Total	7
Commercial | Other | Contractual maturity extensions | Substandard
Financing Receivable, Troubled Debt Restructuring
Total	0
Commercial | Other | Contractual maturity extensions | Doubtful
Financing Receivable, Troubled Debt Restructuring
Total	0
Commercial | Other | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring
Total	0
Principal forgiveness, amount forgiven	0
Commercial | Other | Interest rate concessions
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%
Commercial | Other | Combination
Financing Receivable, Troubled Debt Restructuring
Total	$ 0
Interest rate concessions, initial rate	0.00%
Interest rate concessions, revised rate	0.00%