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Acquisitions, Divestitures, and Assets Held for Sale - Acquisitions (Detail) - USD ($)
$ in Millions
12 Months Ended
Nov. 25, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Purchase price   $ 3 $ 1,527 $ 473
Goodwill   5,395 5,576 5,492
Revenues   $ 8,698 $ 18,470 $ 14,581
Gathering and Processing Assets in the Delaware basin [Member]        
Business Acquisition [Line Items]        
Purchase price $ 1,557      
Changes to the fair value of assets acquired and liabilities assumed      
Current assets 63      
Properties and equipment 467      
Other intangible assets 811      
Accounts payable (19)      
Accrued expenses (38)      
Deferred income taxes (1)      
Asset retirement obligations (9)      
Goodwill 283      
Total assets acquired and liabilities assumed 1,557      
Goodwill amortizable for tax purposes $ 283      
Revenues      
Revenue and earnings that would have been recognized had the acquisition occurred on January 1