Financing Receivables: (Details 7) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Past Due Financing Receivable
Total Past Due (> 90 days)	$ 90	[1]	$ 68	[1]
Current	21,611		23,469
Total Financing Receivables	21,701		23,537
Recorded Investment > 90 Days and Accruing	51		41
Troubled debt restructurings of financing receivables	0		0
Major Markets
Past Due Financing Receivable
Total Financing Receivables	15,176		17,325
Growth Markets
Past Due Financing Receivable
Total Financing Receivables	6,525		6,212
Lease receivables
Past Due Financing Receivable
Total Past Due (> 90 days)	33	[1]	25	[1]
Current	7,962		8,970
Total Financing Receivables	7,995		8,996
Recorded Investment > 90 Days and Accruing	20		16
Lease receivables | Major Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	8	[1]	6	[1]
Current	5,918		6,789
Total Financing Receivables	5,926		6,796
Recorded Investment > 90 Days and Accruing	8		5
Lease receivables | Growth Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	25	[1]	19	[1]
Current	2,044		2,181
Total Financing Receivables	2,069		2,200
Recorded Investment > 90 Days and Accruing	12		11
Loan receivables
Past Due Financing Receivable
Total Past Due (> 90 days)	57	[1]	43	[1]
Current	13,649		14,499
Total Financing Receivables	13,706		14,542
Recorded Investment > 90 Days and Accruing	31		25
Loan receivables | Major Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	12	[1]	9	[1]
Current	9,238		10,520
Total Financing Receivables	9,250		10,529
Recorded Investment > 90 Days and Accruing	12		6
Loan receivables | Growth Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	44	[1]	34	[1]
Current	4,412		3,979
Total Financing Receivables	4,456		4,012
Recorded Investment > 90 Days and Accruing	$ 19		$ 18

[1] Does not include accounts that are fully reserved.