Intangible Assets Including Goodwill (Details 2) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Intangible asset balances by major asset class:
Gross Carrying Amount	$ 7,610	$ 6,543
Accumulated Amortization	(3,237)	(3,057)
Net Carrying Amount	4,373	3,487
Capitalized software
Intangible asset balances by major asset class:
Gross Carrying Amount	1,465	1,348
Accumulated Amortization	(593)	(581)
Net Carrying Amount	872	767
Client relationships
Intangible asset balances by major asset class:
Gross Carrying Amount	2,297	1,856
Accumulated Amortization	(987)	(927)
Net Carrying Amount	1,310	929
Completed technology
Intangible asset balances by major asset class:
Gross Carrying Amount	3,121	2,960
Accumulated Amortization	(1,486)	(1,397)
Net Carrying Amount	1,635	1,563
Patents/trademarks
Intangible asset balances by major asset class:
Gross Carrying Amount	683	335
Accumulated Amortization	(160)	(142)
Net Carrying Amount	523	193
Other
Intangible asset balances by major asset class:
Gross Carrying Amount	44	44
Accumulated Amortization	(11)	(10)
Net Carrying Amount	$ 33	$ 35