Financing Receivables: (Details 5) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 22,831	$ 23,537
Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	16,336	17,325
Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,494	6,212
Lease receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,591	8,996
Lease receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,356	6,796
Lease receivables | Major Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	648	743
Lease receivables | Major Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,243	1,513
Lease receivables | Major Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,172	2,111
Lease receivables | Major Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,349	1,393
Lease receivables | Major Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	519	595
Lease receivables | Major Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	354	365
Lease receivables | Major Markets | CCC+ - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	71	76
Lease receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,235	2,200
Lease receivables | Growth Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	63	68
Lease receivables | Growth Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	168	168
Lease receivables | Growth Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,025	957
Lease receivables | Growth Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	333	350
Lease receivables | Growth Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	350	368
Lease receivables | Growth Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	218	214
Lease receivables | Growth Markets | CCC+ - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	80	74
Loan receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	14,239	14,542
Loan receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	9,980	10,529
Loan receivables | Major Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,017	1,151
Loan receivables | Major Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,952	2,344
Loan receivables | Major Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	3,411	3,271
Loan receivables | Major Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,119	2,158
Loan receivables | Major Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	814	922
Loan receivables | Major Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	555	565
Loan receivables | Major Markets | CCC+ - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	111	118
Loan receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	4,259	4,012
Loan receivables | Growth Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	119	125
Loan receivables | Growth Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	320	307
Loan receivables | Growth Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,953	1,745
Loan receivables | Growth Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	634	638
Loan receivables | Growth Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	666	672
Loan receivables | Growth Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	414	391
Loan receivables | Growth Markets | CCC+ - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 152	$ 134