Intangible Assets Including Goodwill: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Intangible asset balances by major asset class:
Gross Carrying Amount	$ 6,021		$ 5,642
Accumulated Amortization	(2,380)		(2,250)
Net Carrying Amount	3,641		3,392
Net carrying amount increase/(decrease)	249
Intangible asset amortization expense	310	310
Intangible assets retired and fully amortized	180
Capitalized software
Intangible asset balances by major asset class:
Gross Carrying Amount	1,487		1,478
Accumulated Amortization	(669)		(678)
Net Carrying Amount	817		799
Client relationships
Intangible asset balances by major asset class:
Gross Carrying Amount	1,852		1,751
Accumulated Amortization	(754)		(715)
Net Carrying Amount	1,098		1,035
Completed technology
Intangible asset balances by major asset class:
Gross Carrying Amount	2,389		2,156
Accumulated Amortization	(833)		(745)
Net Carrying Amount	1,556		1,411
In-process R and D
Intangible asset balances by major asset class:
Gross Carrying Amount	31		22
Accumulated Amortization	(1)		(1)
Net Carrying Amount	30		21
Patents/trademarks
Intangible asset balances by major asset class:
Gross Carrying Amount	234		207
Accumulated Amortization	(99)		(88)
Net Carrying Amount	135		119
Other intangible assets
Intangible asset balances by major asset class:
Gross Carrying Amount	29		29
Accumulated Amortization	(23)		(22)
Net Carrying Amount	$ 6		$ 7