Finance Receivables and Loans, Net (Consumer Concentration Risk) (Details) - Consumer	Dec. 31, 2021	Dec. 31, 2020
Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	100.00%	100.00%
Automotive loan | CALIFORNIA AND TEXAS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	26.40%	24.70%
Automotive loan | CALIFORNIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	8.70%	8.60%
Automotive loan | TEXAS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	13.00%	12.50%
Automotive loan | FLORIDA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	9.30%	8.80%
Automotive loan | PENNSYLVANIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	4.40%	4.50%
Automotive loan | GEORGIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	4.00%	3.90%
Automotive loan | NORTH CAROLINA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	4.10%	4.10%
Automotive loan | ILLINOIS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.70%	4.00%
Automotive loan | NEW YORK
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.30%	3.20%
Automotive loan | NEW JERSEY
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.00%	2.90%
Automotive loan | OHIO
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.40%	3.50%
Automotive loan | OTHER UNITED STATES
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	43.10%	44.00%
Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	100.00%	100.00%
Mortgage Finance | CALIFORNIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	39.60%	34.30%
Mortgage Finance | TEXAS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	7.30%	8.00%
Mortgage Finance | FLORIDA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	6.30%	5.50%
Mortgage Finance | PENNSYLVANIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	2.30%	2.00%
Mortgage Finance | GEORGIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.00%	3.10%
Mortgage Finance | NORTH CAROLINA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	1.60%	2.30%
Mortgage Finance | ILLINOIS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.10%	3.00%
Mortgage Finance | NEW YORK
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	2.10%	3.40%
Mortgage Finance | NEW JERSEY
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	2.50%	2.20%
Mortgage Finance | OHIO
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	0.50%	0.50%
Mortgage Finance | OTHER UNITED STATES
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	31.70%	35.70%