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Commitments and Contingencies (Details)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2017
USD ($)
Class_Actions
Jun. 30, 2017
USD ($)
Loss Contingencies [Line Items]      
Loss Contingency, payment for SEC investigation   $ 29  
Macondo well incident      
Loss Contingencies [Line Items]      
BP Fault Apportionment in Macondo Ruling 67.00%    
Transocean Fault Apportionment In Macondo Ruling 30.00%    
Halliburton Fault Apportionment In Macondo Ruling 3.00%    
Loss Contingency, Settlement Agreement, Terms $ 1,100    
Securities and related litigation      
Loss Contingencies [Line Items]      
Number Of Similar Class Action Lawsuits That Were Consolidated Into One Suit | Class_Actions   20  
Litigation Settlement, Expense     $ 54
Litigation Settlement, Amount Awarded to Other Party     $ 100