Intangible Assets Including Goodwill: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Intangible asset balances by major asset class:
Gross Carrying Amount	$ 6,929			$ 6,930
Accumulated Amortization	(3,231)			(3,059)
Net Carrying Amount	3,698			3,871
Net carrying amount increase/(decrease)	(173)
Intangible asset amortization expense	339		331
Intangible assets retired and fully amortized	164
Capitalized software
Intangible asset balances by major asset class:
Gross Carrying Amount	1,471			1,494
Accumulated Amortization	(696)			(699)
Net Carrying Amount	775			794
Client relationships
Intangible asset balances by major asset class:
Gross Carrying Amount	2,149			2,148
Accumulated Amortization	(1,050)			(977)
Net Carrying Amount	1,099			1,171
Completed technology
Intangible asset balances by major asset class:
Gross Carrying Amount	2,935			2,910
Accumulated Amortization	(1,312)			(1,224)
Net Carrying Amount	1,623			1,687
In-process R&D
Intangible asset balances by major asset class:
Gross Carrying Amount	2			13
Net Carrying Amount	2			13
Patents/trademarks
Intangible asset balances by major asset class:
Gross Carrying Amount	366			358
Accumulated Amortization	(169)			(154)
Net Carrying Amount	198			204
Other intangible assets
Intangible asset balances by major asset class:
Gross Carrying Amount	7	[1]		7	[1]
Accumulated Amortization	(5)	[1]		(5)	[1]
Net Carrying Amount	$ 2	[1]		$ 2	[1]

[1] *Other intangibles are primarily acquired proprietary and nonproprietary business processes, methodologies and systems.