Finance Receivables - Finance Receivables Summary (Details) - Consumer Finance Receivables [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period			$ 25,623
Balance at end of period	$ 27,987		27,987
Pass [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period			25,623	$ 23,130
Loans purchased			13,107	11,129
Principal collections and other			(8,136)	(7,724)
Charge-offs	(256)	$ (230)	(710)	(645)
Foreign currency translation			(1,897)	(674)
Balance at end of period	27,987	25,216	27,987	25,216
North America Segment [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period			13,361
Balance at end of period	16,994		16,994
North America Segment [Member] | Pass [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period			13,361	11,388
Loans purchased			8,070	4,874
Principal collections and other			(3,818)	(3,102)
Charge-offs	(221)	(194)	(609)	(543)
Foreign currency translation			(10)	(2)
Balance at end of period	16,994	12,615	16,994	12,615
International Segment [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period			12,262
Balance at end of period	10,993		10,993
International Segment [Member] | Pass [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period			12,262	11,742
Loans purchased			5,037	6,255
Principal collections and other			(4,318)	(4,622)
Charge-offs	(35)	(36)	(101)	(102)
Foreign currency translation			(1,887)	(672)
Balance at end of period	$ 10,993	$ 12,601	$ 10,993	$ 12,601