Intangible Assets Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amount	$ 1,083	$ 1,049
Amortization	(870)	(801)
Assets	213	248
Acquired technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	390	373
Amortization	(334)	(300)
Assets	56	73
Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	175	177
Amortization	(168)	(166)
Assets	7	11
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	223	215
Amortization	(144)	(134)
Assets	79	81
Customer relationships and contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	197	193
Amortization	(160)	(144)
Assets	37	49
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	98	91
Amortization	(64)	(57)
Assets	$ 34	$ 34