Intangible Assets Including Goodwill: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,141		$ 7,141		$ 6,679
Accumulated Amortization	(3,139)		(3,139)		(2,892)
Net Carrying Amount	4,003		4,003		3,787
Net carrying amount increase/(decrease)			216
Intangible asset amortization expense	350	324	1,007	952
Intangible assets retired and fully amortized			758
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,518		1,518		1,527
Accumulated Amortization	(688)		(688)		(665)
Net Carrying Amount	829		829		861
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,348		2,348		2,103
Accumulated Amortization	(1,137)		(1,137)		(961)
Net Carrying Amount	1,211		1,211		1,142
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,886		2,886		2,709
Accumulated Amortization	(1,153)		(1,153)		(1,112)
Net Carrying Amount	1,734		1,734		1,597
In-process R&D
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	17		17		28
Net Carrying Amount	17		17		28
Patents/trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	365		365		281
Accumulated Amortization	(156)		(156)		(127)
Net Carrying Amount	209		209		154
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7		7		31
Accumulated Amortization	(5)		(5)		(27)
Net Carrying Amount	$ 2		$ 2		$ 3