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Contingencies and Commitments (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
AUD ($)
Dec. 31, 2016
USD ($)
Contingencies and Commitments      
Damages sought   $ 1,470  
Contracts receivable, claims and uncertain amounts $ 124   $ 61
Amount of disputed back charges $ 18   $ 41