Financing Receivables (Details 2) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) PortfolioSegment ClassOfFinancingReceivable	Dec. 31, 2014 USD ($)
Financing Receivables
Ending Balance	$ 19,099	$ 22,332
Collectively evaluated for impairment	18,552	21,821
Individually evaluated for impairment	546	511
Allowance for Credit Losses
Allowance for credit losses, beginning balance	561	365
Write-offs	(39)	(24)
Provision	107	243
Other	(37)	(23)
Allowance for credit losses, ending balance	593	561
Collectively evaluated for impairment	73	81
Individually evaluated for impairment	$ 520	480
Number of portfolio segments | PortfolioSegment	2
Number of classes of financing receivable | ClassOfFinancingReceivable	2
Major Markets
Financing Receivables
Ending Balance	$ 14,471	15,751
Collectively evaluated for impairment	14,392	15,665
Individually evaluated for impairment	79	86
Allowance for Credit Losses
Allowance for credit losses, beginning balance	111	137
Write-offs	(4)	(18)
Provision	6	3
Other	(6)	(12)
Allowance for credit losses, ending balance	107	111
Collectively evaluated for impairment	39	42
Individually evaluated for impairment	68	69
Growth Markets
Financing Receivables
Ending Balance	4,627	6,581
Collectively evaluated for impairment	4,160	6,156
Individually evaluated for impairment	467	425
Allowance for Credit Losses
Allowance for credit losses, beginning balance	450	228
Write-offs	(35)	(6)
Provision	102	240
Other	(31)	(11)
Allowance for credit losses, ending balance	486	450
Collectively evaluated for impairment	34	39
Individually evaluated for impairment	452	411
Lease receivables
Financing Receivables
Ending Balance	6,885	7,645
Allowance for Credit Losses
Allowance for credit losses, beginning balance	165	123
Allowance for credit losses, ending balance	222	165
Lease receivables | Major Markets
Financing Receivables
Ending Balance	5,404	5,702
Allowance for Credit Losses
Allowance for credit losses, beginning balance	32	42
Allowance for credit losses, ending balance	31	32
Lease receivables | Growth Markets
Financing Receivables
Ending Balance	1,480	1,943
Allowance for Credit Losses
Allowance for credit losses, beginning balance	133	80
Allowance for credit losses, ending balance	191	133
Loan receivables
Financing Receivables
Ending Balance	12,214	14,687
Allowance for Credit Losses
Allowance for credit losses, beginning balance	396	242
Allowance for credit losses, ending balance	371	396
Loan receivables | Major Markets
Financing Receivables
Ending Balance	9,067	10,049
Allowance for Credit Losses
Allowance for credit losses, beginning balance	79	95
Allowance for credit losses, ending balance	76	79
Loan receivables | Growth Markets
Financing Receivables
Ending Balance	3,147	4,639
Allowance for Credit Losses
Allowance for credit losses, beginning balance	317	147
Allowance for credit losses, ending balance	$ 295	$ 317