Finance Receivables and Loans, Net (Concentration Risk) (Details) - Consumer - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
California | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	26.50%
Texas | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans		26.40%
Automotive | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	100.00%	100.00%
Automotive | California | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	8.70%	8.70%
Automotive | Texas | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	13.60%	13.00%
Automotive | Florida | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	9.50%	9.30%
Automotive | Pennsylvania | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	4.50%	4.40%
Automotive | Georgia | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	4.10%	4.00%
Automotive | North Carolina | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	4.10%	4.10%
Automotive | Illinois | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	3.50%	3.70%
Automotive | New York | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	3.60%	3.30%
Automotive | New Jersey | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	3.20%	3.00%
Automotive | Ohio | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	3.40%	3.40%
Automotive | Other United States | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	41.80%	43.10%
Consumer mortgage | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	100.00%	100.00%
Consumer mortgage | California | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	38.80%	39.60%
Consumer mortgage | Texas | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	7.30%	7.30%
Consumer mortgage | Florida | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	6.60%	6.30%
Consumer mortgage | Pennsylvania | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	2.10%	2.30%
Consumer mortgage | Georgia | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	2.90%	3.00%
Consumer mortgage | North Carolina | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	1.90%	1.60%
Consumer mortgage | Illinois | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	2.80%	3.10%
Consumer mortgage | New York | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	1.90%	2.10%
Consumer mortgage | New Jersey | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	2.40%	2.50%
Consumer mortgage | Ohio | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	0.40%	0.50%
Consumer mortgage | Other United States | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	32.90%	31.70%
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value, option, carrying amount, financing receivable, no allowance	$ 3	$ 7	$ 8
Other | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	100.00%	100.00%
Other | California | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	8.40%	9.40%
Other | Texas | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	7.70%	7.40%
Other | Florida | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	7.80%	8.40%
Other | Pennsylvania | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	4.60%	4.50%
Other | Georgia | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	3.50%	3.40%
Other | North Carolina | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	4.60%	3.40%
Other | Illinois | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	4.30%	4.40%
Other | New York | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	4.80%	5.50%
Other | New Jersey | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	3.60%	3.40%
Other | Ohio | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	3.60%	3.90%
Other | Other United States | Financing Receivable | Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial criticized finance receivables and loans	47.10%	46.30%