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Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended 11 Months Ended 12 Months Ended
Mar. 26, 2018
Dec. 31, 2019
Dec. 13, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Acquisitions of Businesses, Net of Cash Acquired   $ 0 $ 0 $ 4 $ (7)
Goodwill   239 $ 0 713 $ 2,727
Other Current Assets   $ 440   $ 693  
Joint Venture in Qatar [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired 50.00%        
Business Combination, Consideration Transferred $ 87        
Payments to Acquire Businesses, Gross 72        
Business Combination, Contingent Consideration, Liability 15        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain 12        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 22        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 25        
Goodwill 27        
Other Current Assets 16        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other 43        
Paid in Accordance with Closing Terms through the Joint Venture [Member] | Joint Venture in Qatar [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross 48        
Will be Made Two Years after Closing [Member] | Joint Venture in Qatar [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross $ 24        
Business Acquisition, Period of Additional Payment after Closing 2 years