Intangible Assets and Goodwill - Amortized Intangible Assets, Excluding Goodwill, By Business Segment (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,812	$ 1,183
Accumulated Amortization	376	322
Products
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	681	173
Accumulated Amortization	80	76
Services
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,131	1,010
Accumulated Amortization	$ 296	$ 246