Intangible Assets Including Goodwill: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011	Dec. 31, 2011
Intangible asset balances by major asset class:
Gross Carrying Amount	$ 6,262			$ 6,262			$ 5,642
Accumulated Amortization	(2,697)			(2,697)			(2,250)
Net Carrying Amount	3,565	[1]		3,565	[1]		3,392
Net carrying amount increase/(decrease)				172
Intangible asset amortization expense	324		307	952		926
Intangible assets retired and fully amortized				503
Capitalized software
Intangible asset balances by major asset class:
Gross Carrying Amount	1,503			1,503			1,478
Accumulated Amortization	(658)			(658)			(678)
Net Carrying Amount	845			845			799
Client relationships
Intangible asset balances by major asset class:
Gross Carrying Amount	1,924			1,924			1,751
Accumulated Amortization	(888)			(888)			(715)
Net Carrying Amount	1,037			1,037			1,035
Completed technology
Intangible asset balances by major asset class:
Gross Carrying Amount	2,530			2,530			2,156
Accumulated Amortization	(1,010)			(1,010)			(745)
Net Carrying Amount	1,521			1,521			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	30			30			21
Patents/trademarks
Intangible asset balances by major asset class:
Gross Carrying Amount	242			242			207
Accumulated Amortization	(115)			(115)			(88)
Net Carrying Amount	128			128			119
Other intangible assets
Intangible asset balances by major asset class:
Gross Carrying Amount	31			31			29
Accumulated Amortization	(26)			(26)			(22)
Net Carrying Amount	$ 5			$ 5			$ 7

[1] Amounts may not add due to rounding.