Finance Receivables and Loans, Net Finance Receivables and Loans, Net (Commercial Concentration Risk) (Details)	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Commercial Concentration Risk	100.00%	100.00%
TEXAS
Concentration Risk [Line Items]
Commercial Concentration Risk	16.10%	17.70%
FLORIDA
Concentration Risk [Line Items]
Commercial Concentration Risk	10.20%	10.00%
MICHIGAN
Concentration Risk [Line Items]
Commercial Concentration Risk	7.90%	8.70%
CALIFORNIA
Concentration Risk [Line Items]
Commercial Concentration Risk	7.60%	8.90%
NORTH CAROLINA
Concentration Risk [Line Items]
Commercial Concentration Risk	4.20%	2.10%
VIRGINIA
Concentration Risk [Line Items]
Commercial Concentration Risk	3.60%	3.60%
GEORGIA
Concentration Risk [Line Items]
Commercial Concentration Risk	3.60%	3.80%
PENNSYLVANIA
Concentration Risk [Line Items]
Commercial Concentration Risk	3.10%	3.40%
NEW YORK
Concentration Risk [Line Items]
Commercial Concentration Risk	2.70%	2.20%
ILLINOIS
Concentration Risk [Line Items]
Commercial Concentration Risk	2.60%	3.10%
Other United States [Member]
Concentration Risk [Line Items]
Commercial Concentration Risk	38.40%	36.50%