Financing Receivables: (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Major Markets	Dec. 31, 2013 Major Markets	Mar. 31, 2014 Growth Markets	Dec. 31, 2013 Growth Markets	Mar. 31, 2014 Lease receivables	Dec. 31, 2013 Lease receivables	Dec. 31, 2012 Lease receivables	Mar. 31, 2014 Lease receivables Major Markets	Dec. 31, 2013 Lease receivables Major Markets	Dec. 31, 2012 Lease receivables Major Markets	Mar. 31, 2014 Lease receivables Growth Markets	Dec. 31, 2013 Lease receivables Growth Markets	Dec. 31, 2012 Lease receivables Growth Markets	Mar. 31, 2014 Loan receivables	Dec. 31, 2013 Loan receivables	Dec. 31, 2012 Loan receivables	Mar. 31, 2014 Loan receivables Major Markets	Dec. 31, 2013 Loan receivables Major Markets	Dec. 31, 2012 Loan receivables Major Markets	Mar. 31, 2014 Loan receivables Growth Markets	Dec. 31, 2013 Loan receivables Growth Markets	Dec. 31, 2012 Loan receivables Growth Markets
Financing Receivables
Ending Balance	$ 22,831	$ 23,537	$ 16,336	$ 17,325	$ 6,494	$ 6,212	$ 8,591	$ 8,996		$ 6,356	$ 6,796		$ 2,235	$ 2,200		$ 14,239	$ 14,542		$ 9,980	$ 10,529		$ 4,259	$ 4,012
Collectively evaluated for impairment	22,494	23,219	16,223	17,206	6,270	6,013
Individually evaluated for impairment	337	318	113	119	224	199
Allowance for Credit Losses
Allowance for credit losses, beginning balance	365	318	137	180	228	138	131	123	114	41	42	59	90	80	55	263	242	204	93	95	121	171	147	84
Write-offs	(8)	(33)	(5)	(23)	(3)	(10)
Provision	39	84	3	(21)	36	105
Other	(1)	(5)	0	1	(1)	(6)
Allowance for credit losses, ending balance	394	365	134	137	260	228	131	123	114	41	42	59	90	80	55	263	242	204	93	95	121	171	147	84
Collectively evaluated for impairment	89	93	41	45	47	48
Individually evaluated for impairment	$ 306	$ 272	$ 93	$ 93	$ 213	$ 179