Financing Receivables: (Details 5) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 19,730	$ 20,060
Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	15,055	15,587
Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	4,675	4,472
Lease receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,396	8,430
Lease receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,446	6,510
Lease receivables | Major Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	576	697
Lease receivables | Major Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,478	1,459
Lease receivables | Major Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,214	2,334
Lease receivables | Major Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,263	1,118
Lease receivables | Major Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	561	534
Lease receivables | Major Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	288	260
Lease receivables | Major Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	66	108
Lease receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,949	1,921
Lease receivables | Growth Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	96	139
Lease receivables | Growth Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	290	306
Lease receivables | Growth Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	727	654
Lease receivables | Growth Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	433	457
Lease receivables | Growth Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	287	252
Lease receivables | Growth Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	98	97
Lease receivables | Growth Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	18	15
Client loan receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	11,335	11,629
Client loan receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,609	9,077
Client loan receivables | Major Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	769	971
Client loan receivables | Major Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,974	2,034
Client loan receivables | Major Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,956	3,255
Client loan receivables | Major Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,687	1,559
Client loan receivables | Major Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	750	744
Client loan receivables | Major Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	385	362
Client loan receivables | Major Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	88	151
Client loan receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,726	2,552
Client loan receivables | Growth Markets | Aaa - Aa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	135	185
Client loan receivables | Growth Markets | A1 - A3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	405	407
Client loan receivables | Growth Markets | Baa1 - Baa3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,017	869
Client loan receivables | Growth Markets | Ba1 - Ba2
Gross recorded investment for each class of receivables, by credit quality indicator
Total	605	607
Client loan receivables | Growth Markets | Ba3 - B1
Gross recorded investment for each class of receivables, by credit quality indicator
Total	402	335
Client loan receivables | Growth Markets | B2 - B3
Gross recorded investment for each class of receivables, by credit quality indicator
Total	137	129
Client loan receivables | Growth Markets | Caa - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 26	$ 20