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Variable Interest Entities (Detail) - Variable Interest Entity, Primary Beneficiary [Member] - Western Gas Partners, LP [Member] - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2017
May 31, 2008
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Variable Interest Entity [Line Items]            
Note receivable for WES   $ 260        
Debt instrument, term   30 years        
Fixed annual rate   6.50%        
Interest income for WES     $ 4 $ 4 $ 8 $ 8
Proceeds from settlement of related party obligation $ 37          
Above-market component of swap extensions with Anadarko         $ 29 $ 16