Finance Receivables - Activity in Allowance for Commercial Loan Losses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	$ 27
Provision for loan losses	604	475
Balance at end of period	31	27
Commercial Finance Receivables [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	51	6
Provision for loan losses	(9)	43
Recoveries	0	6
Charge-offs	0	(5)
Foreign currency translation	(2)	1
Balance at end of period	40	51
North America Segment [Member] | Commercial Finance Receivables [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	17	6	0
Provision for loan losses	4	13	6
Recoveries	0	0	0
Charge-offs	0	(2)	0
Foreign currency translation	0	0	0
Balance at end of period	21	17	6
International Segment [Member] | Commercial Finance Receivables [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Balance at beginning of period	34	0
Provision for loan losses	(13)	30
Recoveries	0	6
Charge-offs	0	(3)
Foreign currency translation	(2)	1
Balance at end of period	$ 19	$ 34