Financing Receivables: (Details 5) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 19,820	$ 20,060
Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	15,105	15,587
Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	4,715	4,472
Lease receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,259	8,430
Lease receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,423	6,510
Lease receivables | Major Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	552	697
Lease receivables | Major Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,522	1,459
Lease receivables | Major Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,244	2,334
Lease receivables | Major Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,218	1,118
Lease receivables | Major Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	542	534
Lease receivables | Major Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	270	260
Lease receivables | Major Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	75	108
Lease receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,836	1,921
Lease receivables | Growth Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	95	139
Lease receivables | Growth Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	231	306
Lease receivables | Growth Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	644	654
Lease receivables | Growth Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	422	457
Lease receivables | Growth Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	315	252
Lease receivables | Growth Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	107	97
Lease receivables | Growth Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	20	15
Client loan receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	11,561	11,629
Client loan receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,682	9,077
Client loan receivables | Major Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	746	971
Client loan receivables | Major Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,057	2,034
Client loan receivables | Major Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	3,033	3,255
Client loan receivables | Major Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,647	1,559
Client loan receivables | Major Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	733	744
Client loan receivables | Major Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	366	362
Client loan receivables | Major Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	101	151
Client loan receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,879	2,552
Client loan receivables | Growth Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	149	185
Client loan receivables | Growth Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	362	407
Client loan receivables | Growth Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,011	869
Client loan receivables | Growth Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	662	607
Client loan receivables | Growth Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	495	335
Client loan receivables | Growth Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	168	129
Client loan receivables | Growth Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 32	$ 20