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Acquisitions and Divestitures Acquisitions and Divestitures (Business Combination) (Details) - Permian Basin [Member]
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
a
Boe
Business Acquisition [Line Items]  
Gas and Oil Area, Developed, Net | a 28,000
Production, Barrels of Oil Equivalents | Boe 1,400
Payments to Acquire Businesses, Net of Cash Acquired $ 428
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 79
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 347
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings 5
AssetRetirementObligationLiabilitiesAcquiredInBusinessCombination (2)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (1)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 428