Financing Receivables (Details 2) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) PortfolioSegment ClassOfFinancingReceivable	Dec. 31, 2014 USD ($)
Financing Receivables
Ending Balance	$ 20,558	$ 22,332
Collectively evaluated for impairment	19,952	21,821
Individually evaluated for impairment	607	511
Allowance for Credit Losses
Allowance for credit losses, beginning balance	561	365
Write-offs	(7)	(24)
Provision	94	243
Other	(15)	(23)
Allowance for credit losses, ending balance	633	561
Collectively evaluated for impairment	76	81
Individually evaluated for impairment	$ 558	480
Number of portfolio segments | PortfolioSegment	2
Number of classes of financing receivable | ClassOfFinancingReceivable	2
Major Markets
Financing Receivables
Ending Balance	$ 14,925	15,751
Collectively evaluated for impairment	14,844	15,665
Individually evaluated for impairment	81	86
Allowance for Credit Losses
Allowance for credit losses, beginning balance	111	137
Write-offs	(2)	(18)
Provision	6	3
Other	(5)	(12)
Allowance for credit losses, ending balance	110	111
Collectively evaluated for impairment	41	42
Individually evaluated for impairment	69	69
Growth Markets
Financing Receivables
Ending Balance	5,633	6,581
Collectively evaluated for impairment	5,108	6,156
Individually evaluated for impairment	525	425
Allowance for Credit Losses
Allowance for credit losses, beginning balance	450	228
Write-offs	(5)	(6)
Provision	88	240
Other	(10)	(11)
Allowance for credit losses, ending balance	524	450
Collectively evaluated for impairment	35	39
Individually evaluated for impairment	489	411
Lease receivables
Financing Receivables
Ending Balance	7,288	7,645
Allowance for Credit Losses
Allowance for credit losses, beginning balance	165	123
Allowance for credit losses, ending balance	210	165
Lease receivables | Major Markets
Financing Receivables
Ending Balance	5,555	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	1,733	1,943
Allowance for Credit Losses
Allowance for credit losses, beginning balance	133	80
Allowance for credit losses, ending balance	180	133
Loan receivables
Financing Receivables
Ending Balance	13,270	14,687
Allowance for Credit Losses
Allowance for credit losses, beginning balance	396	242
Allowance for credit losses, ending balance	423	396
Loan receivables | Major Markets
Financing Receivables
Ending Balance	9,370	10,049
Allowance for Credit Losses
Allowance for credit losses, beginning balance	79	95
Allowance for credit losses, ending balance	79	79
Loan receivables | Growth Markets
Financing Receivables
Ending Balance	3,900	4,639
Allowance for Credit Losses
Allowance for credit losses, beginning balance	317	147
Allowance for credit losses, ending balance	$ 344	$ 317