Finance Receivables and Loans, Net (Commercial Concentration Risk) (Details) - Commercial	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	100.00%	100.00%
Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	100.00%	100.00%
FLORIDA | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	16.40%	13.30%
TEXAS | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	13.90%	13.00%
CALIFORNIA | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	8.30%	7.90%
MICHIGAN | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	5.80%	7.70%
NORTH CAROLINA | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	5.80%	5.50%
NEW YORK | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.80%	5.60%
OHIO | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.40%	1.30%
GEORGIA | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.30%	3.60%
UTAH | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	3.00%	3.00%
ILLINOIS | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	2.90%	2.80%
OTHER UNITED STATES | Mortgage/Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost, finance receivables and loans, percentage	33.40%	36.30%