Finance Receivables - Finance Receivables Summary (Details) - Consumer Finance Receivables [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	$ 27,330		27,330
Pass [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period			25,623	$ 23,130
Loans purchased			8,366	7,045
Principal collections and other			(5,294)	(5,039)
Charge-offs	(220)	$ (191)	(454)	(415)
Foreign currency translation			(911)	325
Balance at end of period	27,330	25,046	27,330	25,046
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	15,490		15,490
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			4,915	2,917
Principal collections and other			(2,393)	(2,052)
Charge-offs	(188)	(157)	(388)	(349)
Foreign currency translation			(5)	0
Balance at end of period	15,490	11,904	15,490	11,904
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	11,840		11,840
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			3,451	4,128
Principal collections and other			(2,901)	(2,987)
Charge-offs	(32)	(34)	(66)	(66)
Foreign currency translation			(906)	325
Balance at end of period	$ 11,840	$ 13,142	$ 11,840	$ 13,142