Financing Receivables: (Details 5) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 21,701	$ 23,537
Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	15,176	17,325
Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,525	6,212
Lease receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	7,995	8,996
Lease receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	5,926	6,796
Lease receivables | Major Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	501	743
Lease receivables | Major Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,460	1,513
Lease receivables | Major Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,732	2,111
Lease receivables | Major Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,253	1,393
Lease receivables | Major Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	547	595
Lease receivables | Major Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	380	365
Lease receivables | Major Markets | CCC+ - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	53	76
Lease receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,069	2,200
Lease receivables | Growth Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	50	68
Lease receivables | Growth Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	140	168
Lease receivables | Growth Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,048	957
Lease receivables | Growth Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	347	350
Lease receivables | Growth Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	247	368
Lease receivables | Growth Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	148	214
Lease receivables | Growth Markets | CCC+ - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	90	74
Loan receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	13,706	14,542
Loan receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	9,250	10,529
Loan receivables | Major Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	782	1,151
Loan receivables | Major Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,279	2,344
Loan receivables | Major Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,703	3,271
Loan receivables | Major Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,957	2,158
Loan receivables | Major Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	854	922
Loan receivables | Major Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	593	565
Loan receivables | Major Markets | CCC+ - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	83	118
Loan receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	4,456	4,012
Loan receivables | Growth Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	107	125
Loan receivables | Growth Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	302	307
Loan receivables | Growth Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,256	1,745
Loan receivables | Growth Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	747	638
Loan receivables | Growth Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	532	672
Loan receivables | Growth Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	318	391
Loan receivables | Growth Markets | CCC+ - D
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 194	$ 134