Intangible Assets Including Goodwill: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Intangible asset balances by major asset class:
Gross Carrying Amount	$ 6,367		$ 6,367		$ 6,679
Accumulated Amortization	(2,949)		(2,949)		(2,892)
Net Carrying Amount	3,418		3,418		3,787
Net carrying amount increase/(decrease)			(369)
Intangible asset amortization expense	326	318	657	627
Intangible assets retired and fully amortized			598
Capitalized software
Intangible asset balances by major asset class:
Gross Carrying Amount	1,522		1,522		1,527
Accumulated Amortization	(677)		(677)		(665)
Net Carrying Amount	845		845		861
Client relationships
Intangible asset balances by major asset class:
Gross Carrying Amount	2,059		2,059		2,103
Accumulated Amortization	(1,068)		(1,068)		(961)
Net Carrying Amount	991		991		1,142
Completed technology
Intangible asset balances by major asset class:
Gross Carrying Amount	2,483		2,483		2,709
Accumulated Amortization	(1,050)		(1,050)		(1,112)
Net Carrying Amount	1,433		1,433		1,597
In-process R&D
Intangible asset balances by major asset class:
Gross Carrying Amount	15		15		28
Net Carrying Amount	15		15		28
Patents/trademarks
Intangible asset balances by major asset class:
Gross Carrying Amount	280		280		281
Accumulated Amortization	(149)		(149)		(127)
Net Carrying Amount	131		131		154
Other intangible assets
Intangible asset balances by major asset class:
Gross Carrying Amount	8		8		31
Accumulated Amortization	(5)		(5)		(27)
Net Carrying Amount	$ 2		$ 2		$ 3