Intangible Assets Including Goodwill: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Intangible asset balances by major asset class:
Gross Carrying Amount	$ 6,514		$ 6,679
Accumulated Amortization	(2,913)		(2,892)
Net Carrying Amount	3,601		3,787
Net carrying amount increase/(decrease)	(186)
Intangible asset amortization expense	331	310
Intangible assets retired and fully amortized	308
Capitalized software
Intangible asset balances by major asset class:
Gross Carrying Amount	1,525		1,527
Accumulated Amortization	(670)		(665)
Net Carrying Amount	855		861
Client relationships
Intangible asset balances by major asset class:
Gross Carrying Amount	2,067		2,103
Accumulated Amortization	(1,001)		(961)
Net Carrying Amount	1,066		1,142
Completed technology
Intangible asset balances by major asset class:
Gross Carrying Amount	2,613		2,709
Accumulated Amortization	(1,093)		(1,112)
Net Carrying Amount	1,519		1,597
In-process R&D
Intangible asset balances by major asset class:
Gross Carrying Amount	15		28
Net Carrying Amount	15		28
Patents/trademarks
Intangible asset balances by major asset class:
Gross Carrying Amount	282		281
Accumulated Amortization	(139)		(127)
Net Carrying Amount	143		154
Other intangible assets
Intangible asset balances by major asset class:
Gross Carrying Amount	12		31
Accumulated Amortization	(9)		(27)
Net Carrying Amount	$ 3		$ 3