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Rosetta Merger Debt (Details) - USD ($)
$ in Millions
7 Months Ended
Jul. 21, 2015
Jul. 20, 2015
Jul. 28, 2015
Jun. 30, 2015
Jun. 30, 2014
Debt Instrument [Line Items]          
Debt       $ 6,198 $ 6,197
Rosetta Resources, Inc [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Debt Exchange, Percent of Outstanding Notes Tendered for Exchange     99.40%    
Debt Exchange, Principal Amount of Outstanding Notes Not Tendered for Exchange     $ 11    
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | Credit Facility, due April 12, 2018 [Member]          
Debt Instrument [Line Items]          
Debt instrument, maturity date   Apr. 12, 2018      
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | 5.625% Senior Notes, due May 1, 2021 [Member]          
Debt Instrument [Line Items]          
Debt instrument, maturity date   May 01, 2021      
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | 5.875% Senior Notes, due June 1, 2022 [Member]          
Debt Instrument [Line Items]          
Debt instrument, maturity date   Jun. 01, 2022      
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | 5.875 Senior Notes, due June 1, 2024 [Member]          
Debt Instrument [Line Items]          
Debt instrument, maturity date   Jun. 01, 2024      
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member] | Credit Facility, due April 12, 2018 [Member]          
Debt Instrument [Line Items]          
Repayments of Debt $ 70        
Debt   $ 70      
Interest Rate (percentage in hundredths)   0.00%      
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | 7.25% Senior Notes, due October 15, 2023          
Debt Instrument [Line Items]          
Debt   $ 1,870      
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | 7.25% Senior Notes, due October 15, 2023 | 5.625% Senior Notes, due May 1, 2021 [Member]          
Debt Instrument [Line Items]          
Debt   $ 700      
Interest Rate (percentage in hundredths)   5.625%      
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | 7.25% Senior Notes, due October 15, 2023 | 5.875% Senior Notes, due June 1, 2022 [Member]          
Debt Instrument [Line Items]          
Debt   $ 600      
Interest Rate (percentage in hundredths)   5.875%      
Rosetta Resources, Inc [Member] | Subsequent Event [Member] | 7.25% Senior Notes, due October 15, 2023 | 5.875 Senior Notes, due June 1, 2024 [Member]          
Debt Instrument [Line Items]          
Debt   $ 500      
Interest Rate (percentage in hundredths)   5.875%