Finance Receivables - Credit Quality (Details) - Consumer Finance Receivables [Member] - Automobile Loan [Member] - North America [Member] - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 18,148	$ 13,361
Percent	100.00%	100.00%
FICO score 680 and greater [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 4,418	$ 596
Percent	24.40%	4.40%
FICO score 620 to 679 [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 2,890	$ 1,691
Percent	15.90%	12.70%
FICO Scores Less Than 620 [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 10,840	$ 11,074
Percent	59.70%	82.90%