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Acquisitions (Details) - USD ($)
1 Months Ended 11 Months Ended 12 Months Ended
Mar. 26, 2018
Dec. 31, 2019
Dec. 13, 2019
Dec. 31, 2020
Dec. 31, 2018
Business Acquisition [Line Items]          
Acquisitions of Businesses, Net of Cash Acquired   $ 0 $ 0 $ 0 $ 4,000,000
Goodwill   239,000,000 $ 0 0 $ 713,000,000
Other Current Assets   $ 440,000,000   349,000,000  
Joint Venture in Qatar [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired 50.00%        
Business Combination, Consideration Transferred $ 87,000,000        
Payments to Acquire Businesses, Gross 72,000,000     24,000,000  
Business Combination, Contingent Consideration, Liability       $ 15,000,000  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain 12,000,000        
Joint Venture in Qatar [Member] | Paid in Accordance with Closing Terms through the Joint Venture [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross 48,000,000        
Joint Venture in Qatar [Member] | Will be Made Two Years after Closing [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross $ 24,000,000