Intangible Assets Including Goodwill: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Intangible asset balances by major asset class:
Gross Carrying Amount	$ 6,204		$ 6,204		$ 5,642
Accumulated Amortization	(2,547)		(2,547)		(2,250)
Net Carrying Amount	3,657		3,657		3,392
Net carrying amount increase/(decrease)			265
Intangible asset amortization expense	318	309	627	619
Intangible assets retired and fully amortized			329
Capitalized software
Intangible asset balances by major asset class:
Gross Carrying Amount	1,497		1,497		1,478
Accumulated Amortization	(663)		(663)		(678)
Net Carrying Amount	834		834		799
Client relationships
Intangible asset balances by major asset class:
Gross Carrying Amount	1,922		1,922		1,751
Accumulated Amortization	(823)		(823)		(715)
Net Carrying Amount	1,099		1,099		1,035
Completed technology
Intangible asset balances by major asset class:
Gross Carrying Amount	2,478		2,478		2,156
Accumulated Amortization	(925)		(925)		(745)
Net Carrying Amount	1,552		1,552		1,411
In-process R&D
Intangible asset balances by major asset class:
Gross Carrying Amount	31		31		22
Accumulated Amortization	(2)		(2)		(1)
Net Carrying Amount	29		29		21
Patents/trademarks
Intangible asset balances by major asset class:
Gross Carrying Amount	247		247		207
Accumulated Amortization	(109)		(109)		(88)
Net Carrying Amount	138		138		119
Other intangible assets
Intangible asset balances by major asset class:
Gross Carrying Amount	30		30		29
Accumulated Amortization	(25)		(25)		(22)
Net Carrying Amount	$ 5		$ 5		$ 7