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Asset Retirement Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in asset retirement obligations [Line Items]        
Document Fiscal Year Focus 2016      
Asset Retirement Obligation $ 156 $ 194 $ 186 $ 122
Asset Retirement Obligation, Accretion Expense 10 10 8  
Asset Retirement Obligation, Liabilities Incurred 15 6 58  
Asset Retirement Obligation, Revision of Estimate (23) (2) 16  
Asset Retirement Obligation, Liabilities Settled 40 6 18  
Asset Retirement Obligation, Current (2) (2) (3)  
Asset Retirement Obligations, Noncurrent 154 $ 192 183  
Anadarko Basin Acquisition [Member]        
Change in asset retirement obligations [Line Items]        
Asset Retirement Obligation, Liabilities Incurred 8      
China [Member]        
Change in asset retirement obligations [Line Items]        
Asset Retirement Obligation, Liabilities Incurred     28  
Domestic Tax Authority [Member]        
Change in asset retirement obligations [Line Items]        
Asset Retirement Obligation, Liabilities Incurred     30  
Texas Asset Sale [Member]        
Change in asset retirement obligations [Line Items]        
Asset retirement obligation liabilities settled through property sales $ 35      
Granite Wash [Member]        
Change in asset retirement obligations [Line Items]        
Asset retirement obligation liabilities settled through property sales     $ 10