Intangible Assets Including Goodwill - Intangible Assets by Class (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Intangible asset balances by major asset class:
Gross Carrying Amount	$ 8,663	$ 6,543
Accumulated Amortization	(3,515)	(3,057)
Net Carrying Amount	5,148	3,487
Capitalized software
Intangible asset balances by major asset class:
Gross Carrying Amount	1,486	1,348
Accumulated Amortization	(604)	(581)
Net Carrying Amount	882	767
Client relationships
Intangible asset balances by major asset class:
Gross Carrying Amount	2,861	1,856
Accumulated Amortization	(1,093)	(927)
Net Carrying Amount	1,769	929
Completed technology
Intangible asset balances by major asset class:
Gross Carrying Amount	3,509	2,960
Accumulated Amortization	(1,615)	(1,397)
Net Carrying Amount	1,894	1,563
Patents/trademarks
Intangible asset balances by major asset class:
Gross Carrying Amount	762	335
Accumulated Amortization	(190)	(142)
Net Carrying Amount	572	193
Other intangible assets
Intangible asset balances by major asset class:
Gross Carrying Amount	44	44
Accumulated Amortization	(12)	(10)
Net Carrying Amount	$ 32	$ 35