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Business Combinations and Divestitures - Acquisitions (Details) - USD ($)
$ in Millions
Mar. 26, 2018
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 2,632   $ 2,727
Other Current Assets   $ 334 $ 342 $ 332
Joint Venture in Qatar        
Business Acquisition [Line Items]        
Percentage of voting interests acquired 50.00%      
Consideration transferred $ 87      
Cash $ 72      
Period of additional payment after closing 2 years      
Contingent consideration, liability $ 15      
Equity interest in acquiree, remeasurement gain 12      
Intangible assets 22      
Property, plant, and equipment 25      
Goodwill 27      
Other Current Assets 16      
Liabilities, other 43      
Joint Venture in Qatar | Paid in Accordance with Closing Terms through the Joint Venture        
Business Acquisition [Line Items]        
Cash 48      
Joint Venture in Qatar | Will be Made Two Years after Closing        
Business Acquisition [Line Items]        
Cash $ 24