Financing Receivables: (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Major Markets	Dec. 31, 2013 Major Markets	Sep. 30, 2014 Growth Markets	Dec. 31, 2013 Growth Markets	Sep. 30, 2014 Lease receivables	Dec. 31, 2013 Lease receivables	Dec. 31, 2012 Lease receivables	Sep. 30, 2014 Lease receivables Major Markets	Dec. 31, 2013 Lease receivables Major Markets	Dec. 31, 2012 Lease receivables Major Markets	Sep. 30, 2014 Lease receivables Growth Markets	Dec. 31, 2013 Lease receivables Growth Markets	Dec. 31, 2012 Lease receivables Growth Markets	Sep. 30, 2014 Loan receivables	Dec. 31, 2013 Loan receivables	Dec. 31, 2012 Loan receivables	Sep. 30, 2014 Loan receivables Major Markets	Dec. 31, 2013 Loan receivables Major Markets	Dec. 31, 2012 Loan receivables Major Markets	Sep. 30, 2014 Loan receivables Growth Markets	Dec. 31, 2013 Loan receivables Growth Markets	Dec. 31, 2012 Loan receivables Growth Markets
Financing Receivables
Ending Balance	$ 21,701	$ 23,537	$ 15,176	$ 17,325	$ 6,525	$ 6,212	$ 7,995	$ 8,996		$ 5,926	$ 6,796		$ 2,069	$ 2,200		$ 13,706	$ 14,542		$ 9,250	$ 10,529		$ 4,456	$ 4,012
Collectively evaluated for impairment	21,209	23,219	15,081	17,206	6,128	6,013
Individually evaluated for impairment	492	318	95	119	397	199
Allowance for Credit Losses
Allowance for credit losses, beginning balance	365	318	137	180	228	138	161	123	114	34	42	59	127	80	55	343	242	204	82	95	121	261	147	84
Write-offs	(19)	(33)	(14)	(23)	(5)	(10)
Provision	170	84	1	(21)	169	105
Other	(12)	(5)	(8)	1	(4)	(6)
Allowance for credit losses, ending balance	504	365	116	137	388	228	161	123	114	34	42	59	127	80	55	343	242	204	82	95	121	261	147	84
Collectively evaluated for impairment	75	93	40	45	35	48
Individually evaluated for impairment	$ 428	$ 272	$ 76	$ 93	$ 352	$ 179