XML 48 R35.htm IDEA: XBRL DOCUMENT v3.5.0.2
Acquisitions and Divestitures Acquisitions and Divestitures (Business Combination) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
a
Boe
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]    
Payments to Acquire Businesses, Net of Cash Acquired $ 429.0 $ 0.0
Permian Basin [Member]    
Business Acquisition [Line Items]    
Oil and gas acres acquired | a 28,000  
Production, Barrels of Oil Equivalents | Boe 1,400  
Payments to Acquire Businesses, Net of Cash Acquired $ 429.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 79.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 348.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings 5.0  
AssetRetirementObligationLiabilitiesAcquiredInBusinessCombination (3.0)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 429.0  
Business Acquisition, Transaction Costs $ 1.0