Finance Receivables - Finance Receivables Summary (Details) (Consumer Finance Receivables [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period			$ 25,623
Balance at end of period	25,591		25,623
Pass [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing receivables, net of fees - beginning of period	25,623	23,130
Loans purchased	4,078	3,412
Principal collections and other	(2,593)	(2,467)
Charge-offs	(234)	(224)
Foreign currency translation	(1,283)	173
Balance at end of period	25,591	24,024
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	14,294		13,361
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	2,273	1,364
Principal collections and other	(1,134)	(1,003)
Charge-offs	(200)	(192)
Foreign currency translation	(6)	(1)
Balance at end of period	14,294	11,556
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	11,297		12,262
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	1,805	2,048
Principal collections and other	(1,459)	(1,464)
Charge-offs	(34)	(32)
Foreign currency translation	(1,277)	174
Balance at end of period	$ 11,297	$ 12,468