Acquisitions And Divestitures Acquisition of Control-Tec LLC (Details) - USD ($)	Nov. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 1,944,000,000	$ 1,502,000,000	$ 1,531,000,000
Control-Tec LLC
Business Acquisition [Line Items]
Business Acquisition, Percentage of Equity Interests Acquired	100.00%
Purchase price, cash consideration, net of cash acquired	$ 104,000,000
Contingent Consideration Arrangement, Range of Outcomes, Value, High	40,000,000
Contingent Consideration Arrangement, Range of Outcomes, Value, Low	$ 0
Contingent Consideration Period	3 years
Contingent consideration liability	$ 20,000,000
Total purchase price	124,000,000
Intangible assets	66,000,000
Other assets purchased and liabilities assumed, net	4,000,000
Identifiable net assets acquired	70,000,000
Goodwill	54,000,000
Total purchase price allocation	$ 124,000,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years