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Business Combinations and Divestitures - Acquisitions (Details) - Joint Venture in Qatar
$ in Millions
Mar. 26, 2018
USD ($)
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
Paid in Accordance with Closing Terms through the Joint Venture  
Business Acquisition [Line Items]  
Cash 48
Will be Made Two Years after Closing  
Business Acquisition [Line Items]  
Cash $ 24