Finance Receivables - Finance Receivables Summary (Details) - Retail 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	$ 25,623	$ 23,130	$ 10,789
Acquisition	0	0	10,310
Purchases	17,537	15,085	9,597
Principal collections and other	(10,968)	(10,234)	(7,029)
Charge-offs	(996)	(914)	(638)
Foreign currency translation	(2,072)	(1,444)	101
Balance at end of period	29,124	25,623	23,130
North America [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	13,361	11,388	10,789
Acquisition	0	0	0
Purchases	10,931	6,808	5,126
Principal collections and other	(5,272)	(4,054)	(3,943)
Charge-offs	(859)	(776)	(584)
Foreign currency translation	(13)	(5)	0
Balance at end of period	18,148	13,361	11,388
International [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	12,262	11,742	0
Acquisition	0	0	10,310
Purchases	6,606	8,277	4,471
Principal collections and other	(5,696)	(6,180)	(3,086)
Charge-offs	(137)	(138)	(54)
Foreign currency translation	(2,059)	(1,439)	101
Balance at end of period	$ 10,976	$ 12,262	$ 11,742