Finance Receivables and Loans, Net Finance Receivables and Loans, Net (Commercial Criticized Exposure) (Details)	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Commercial Criticized Finance Receivables and Loans	100.00%	100.00%
5500 Retail, Auto Dealers and Gasoline Stations [Member]
Concentration Risk [Line Items]
Commercial Criticized Finance Receivables and Loans	81.20%	80.50%
310000 to 330000 Manufacturing [Member]
Concentration Risk [Line Items]
Commercial Criticized Finance Receivables and Loans	6.30%	5.30%
540000 to 549999 Professional, Scientific, and Technical Services [Member]
Concentration Risk [Line Items]
Commercial Criticized Finance Receivables and Loans	4.20%	3.30%
810000 to 819999 Other Services (except Public Administration) [Member]
Concentration Risk [Line Items]
Commercial Criticized Finance Receivables and Loans	8.30%	10.90%