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Risks And Uncertainties (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
business
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Unusual Risk or Uncertainty [Line Items]        
Number of SBUs | business 4      
Number of strategic business units | segment 4      
Segment Reporting, Additional Information about Entity's Reportable Segments | business 2      
Cash and Cash Equivalents, at Carrying Value $ 1,166 $ 949    
Percentage of Total Revenue Non-U.S. 68.00%      
Cash and cash equivalents $ 2,003 1,788 $ 1,960 $ 1,951
Investment in and advances to subsidiaries and affiliates 1,114 $ 1,197 $ 621  
Debt Default Amount [1] $ 351      
Percentage of total revenues from a single customer (less than) 10.00%      
Cash and Cash Equivalents [Member]        
Unusual Risk or Uncertainty [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 1,200      
[1] This does not include $483 million of non-recourse debt at Colon, one of the Company’s subsidiaries in Panama, that has been classified as current. Colon is currently in compliance with all provisions of its financing agreements, but does not expect to complete a required contract assignment to the lenders by the March 31, 2019 deadline. The Company is working with the lenders to modify the loan agreement to amend the requirement of this technical covenant in 2019. If this amendment is executed, the debt will be re-classified as noncurrent.