Financing Receivables: (Details 5) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 21,524	$ 22,510
Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	15,511	16,701
Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,013	5,808
Lease receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,958	9,174
Lease receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,823	7,036
Lease receivables | Major Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	636	646
Lease receivables | Major Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,556	1,664
Lease receivables | Major Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,358	2,285
Lease receivables | Major Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,256	1,367
Lease receivables | Major Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	549	552
Lease receivables | Major Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	381	399
Lease receivables | Major Markets | CCC+ - D-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	86	124
Lease receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,135	2,138
Lease receivables | Growth Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	78	86
Lease receivables | Growth Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	209	223
Lease receivables | Growth Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	795	776
Lease receivables | Growth Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	412	450
Lease receivables | Growth Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	408	418
Lease receivables | Growth Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	167	127
Lease receivables | Growth Markets | CCC+ - D-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	66	58
Client loan receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	12,566	13,336
Client loan receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,688	9,666
Client loan receivables | Major Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	810	887
Client loan receivables | Major Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,982	2,286
Client loan receivables | Major Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	3,003	3,139
Client loan receivables | Major Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,599	1,878
Client loan receivables | Major Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	699	758
Client loan receivables | Major Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	486	548
Client loan receivables | Major Markets | CCC+ - D-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	109	170
Client loan receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	3,878	3,670
Client loan receivables | Growth Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	141	148
Client loan receivables | Growth Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	379	382
Client loan receivables | Growth Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,445	1,333
Client loan receivables | Growth Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	748	773
Client loan receivables | Growth Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	741	718
Client loan receivables | Growth Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	304	218
Client loan receivables | Growth Markets | CCC+ - D-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 120	$ 99