Finance Receivables and Loans, Net Finance Receivables and Loans, Net (Consumer Concentration Risk by State and Foreign Geographic Region (Details)	Dec. 31, 2016	Dec. 31, 2015
Texas and California [Member]
Concentration Risk [Line Items]
Consumer Concentration Risk	24.20%	23.50%
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Concentration Risk [Line Items]
Consumer Concentration Risk	100.00%	100.00%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | TEXAS
Concentration Risk [Line Items]
Consumer Concentration Risk	13.60%	13.70%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | CALIFORNIA
Concentration Risk [Line Items]
Consumer Concentration Risk	7.80%	7.30%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | FLORIDA
Concentration Risk [Line Items]
Consumer Concentration Risk	8.20%	7.70%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | PENNSYLVANIA
Concentration Risk [Line Items]
Consumer Concentration Risk	4.70%	5.00%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | ILLINOIS
Concentration Risk [Line Items]
Consumer Concentration Risk	4.30%	4.40%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | GEORGIA
Concentration Risk [Line Items]
Consumer Concentration Risk	4.30%	4.40%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | NORTH CAROLINA
Concentration Risk [Line Items]
Consumer Concentration Risk	3.60%	3.60%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | OHIO
Concentration Risk [Line Items]
Consumer Concentration Risk	3.50%	3.70%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | NEW YORK
Concentration Risk [Line Items]
Consumer Concentration Risk	3.20%	3.50%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | MICHIGAN
Concentration Risk [Line Items]
Consumer Concentration Risk	2.70%	3.10%
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Other United States [Member]
Concentration Risk [Line Items]
Consumer Concentration Risk	44.10%	43.60%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Concentration Risk [Line Items]
Consumer Concentration Risk	100.00%	100.00%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | TEXAS
Concentration Risk [Line Items]
Consumer Concentration Risk	6.60%	6.20%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | CALIFORNIA
Concentration Risk [Line Items]
Consumer Concentration Risk	34.20%	33.60%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | FLORIDA
Concentration Risk [Line Items]
Consumer Concentration Risk	4.40%	4.10%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | PENNSYLVANIA
Concentration Risk [Line Items]
Consumer Concentration Risk	1.50%	1.50%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | ILLINOIS
Concentration Risk [Line Items]
Consumer Concentration Risk	3.40%	4.10%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | GEORGIA
Concentration Risk [Line Items]
Consumer Concentration Risk	2.20%	2.20%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | NORTH CAROLINA
Concentration Risk [Line Items]
Consumer Concentration Risk	1.60%	1.80%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | OHIO
Concentration Risk [Line Items]
Consumer Concentration Risk	0.50%	0.60%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | NEW YORK
Concentration Risk [Line Items]
Consumer Concentration Risk	1.90%	1.90%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | MICHIGAN
Concentration Risk [Line Items]
Consumer Concentration Risk	1.90%	2.40%
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | Other United States [Member]
Concentration Risk [Line Items]
Consumer Concentration Risk	41.80%	41.60%