Intangible Assets and Goodwill - Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill Activity
Goodwill, net of impairment losses	$ 728
Goodwill acquired	185
Purchase accounting adjustments	2
Foreign currency	17
Goodwill, net of impairment losses	932
Products
Goodwill Activity
Goodwill, net of impairment losses	316
Goodwill acquired	0
Purchase accounting adjustments	0
Foreign currency	0
Goodwill, net of impairment losses	316
Services
Goodwill Activity
Goodwill, net of impairment losses	412
Goodwill acquired	185
Purchase accounting adjustments	2
Foreign currency	17
Goodwill, net of impairment losses	$ 616