Financing Receivables (Details 5) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 19,099	$ 22,332
Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	14,471	15,751
Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	4,627	6,581
Lease receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,885	7,645
Lease receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	5,404	5,702
Lease receivables | Major Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	621	563
Lease receivables | Major Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,170	1,384
Lease receivables | Major Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,502	1,704
Lease receivables | Major Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,172	1,154
Lease receivables | Major Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	500	470
Lease receivables | Major Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	400	372
Lease receivables | Major Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	39	55
Lease receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,480	1,943
Lease receivables | Growth Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	33	46
Lease receivables | Growth Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	124	178
Lease receivables | Growth Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	587	900
Lease receivables | Growth Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	229	272
Lease receivables | Growth Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	260	286
Lease receivables | Growth Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	171	176
Lease receivables | Growth Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	76	85
Loan receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	12,214	14,687
Loan receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	9,067	10,049
Loan receivables | Major Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,042	993
Loan receivables | Major Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,963	2,438
Loan receivables | Major Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,520	3,003
Loan receivables | Major Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,966	2,034
Loan receivables | Major Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	839	827
Loan receivables | Major Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	672	655
Loan receivables | Major Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	65	98
Loan receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	3,147	4,639
Loan receivables | Growth Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	70	110
Loan receivables | Growth Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	263	425
Loan receivables | Growth Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,248	2,148
Loan receivables | Growth Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	488	649
Loan receivables | Growth Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	553	683
Loan receivables | Growth Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	365	420
Loan receivables | Growth Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 161	$ 203