Financing Receivables: (Details 7) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Past Due Financing Receivable
Total Past Due (> 90 days)	$ 68	[1]	$ 68	[1]
Current	22,763		23,469
Total Financing Receivables	22,831		23,537
Recorded Investment > 90 Days and Accruing	35		41
Troubled debt restructurings of financing receivables	0		0
Major Markets
Past Due Financing Receivable
Total Financing Receivables	16,336		17,325
Growth Markets
Past Due Financing Receivable
Total Financing Receivables	6,494		6,212
Lease receivables
Past Due Financing Receivable
Total Past Due (> 90 days)	25	[1]	25	[1]
Current	8,566		8,970
Total Financing Receivables	8,591		8,996
Recorded Investment > 90 Days and Accruing	18		16
Lease receivables | Major Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	8	[1]	6	[1]
Current	6,348		6,789
Total Financing Receivables	6,356		6,796
Recorded Investment > 90 Days and Accruing	8		5
Lease receivables | Growth Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	17	[1]	19	[1]
Current	2,218		2,181
Total Financing Receivables	2,235		2,200
Recorded Investment > 90 Days and Accruing	10		11
Loan receivables
Past Due Financing Receivable
Total Past Due (> 90 days)	43	[1]	43	[1]
Current	14,197		14,499
Total Financing Receivables	14,239		14,542
Recorded Investment > 90 Days and Accruing	18		25
Loan receivables | Major Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	11	[1]	9	[1]
Current	9,969		10,520
Total Financing Receivables	9,980		10,529
Recorded Investment > 90 Days and Accruing	11		6
Loan receivables | Growth Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	31	[1]	34	[1]
Current	4,228		3,979
Total Financing Receivables	4,259		4,012
Recorded Investment > 90 Days and Accruing	$ 6		$ 18

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