Financing Receivables (Details 5) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 20,558	$ 22,332
Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	14,925	15,751
Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	5,633	6,581
Lease receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	7,288	7,645
Lease receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	5,555	5,702
Lease receivables | Major Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	608	563
Lease receivables | Major Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,277	1,384
Lease receivables | Major Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,523	1,704
Lease receivables | Major Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,212	1,154
Lease receivables | Major Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	473	470
Lease receivables | Major Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	420	372
Lease receivables | Major Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	42	55
Lease receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,733	1,943
Lease receivables | Growth Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	47	46
Lease receivables | Growth Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	178	178
Lease receivables | Growth Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	738	900
Lease receivables | Growth Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	257	272
Lease receivables | Growth Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	264	286
Lease receivables | Growth Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	172	176
Lease receivables | Growth Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	77	85
Loan receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	13,270	14,687
Loan receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	9,370	10,049
Loan receivables | Major Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,025	993
Loan receivables | Major Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,154	2,438
Loan receivables | Major Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,568	3,003
Loan receivables | Major Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,043	2,034
Loan receivables | Major Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	799	827
Loan receivables | Major Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	709	655
Loan receivables | Major Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	72	98
Loan receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	3,900	4,639
Loan receivables | Growth Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	106	110
Loan receivables | Growth Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	400	425
Loan receivables | Growth Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,661	2,148
Loan receivables | Growth Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	577	649
Loan receivables | Growth Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	595	683
Loan receivables | Growth Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	388	420
Loan receivables | Growth Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 173	$ 203