Finance Receivables - Commercial Finance Receivables (Details) - Commercial Finance Receivables [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	$ 8,072	$ 6,700	$ 560
Acquisition	0	0	4,834
Net funding (collections)	984	1,889	1,178
Charge-offs	(3)	0	(5)
Foreign currency translation	(614)	(517)	133
Balance at end of period	8,439	8,072	6,700
North America [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	3,180	1,975	560
Acquisition	0	0	0
Net funding (collections)	933	1,228	1,424
Charge-offs	(2)	0	(2)
Foreign currency translation	(60)	(23)	(7)
Balance at end of period	4,051	3,180	1,975
International [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	4,892	4,725	0
Acquisition	0	0	4,834
Net funding (collections)	51	661	(246)
Charge-offs	(1)	0	(3)
Foreign currency translation	(554)	(494)	140
Balance at end of period	$ 4,388	$ 4,892	$ 4,725