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Additional Shareholders' Equity Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 15, 2017
Jun. 26, 2017
Apr. 24, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 15, 2018
Common stock shares issued [Rollforward]                
Shares, beginning of period (in shares)         471,360,427 469,718,512    
Exercise of common stock options (in shares)         382,882 954,898    
Restricted stock awards, net of forfeitures (in shares)         2,912,936 687,017    
Stock issued (shares)         54,087,136 0    
Shares, end of period (in shares)         528,743,381 471,360,427 469,718,512  
Treasury stock [Rollforward]                
Shares, beginning of period (in shares)         37,961,316 37,925,625    
Shares received from employees in payment of withholding taxes due on vesting of shares of restricted stock (in shares)         1,026,891 236,700    
Rabbi Trust Shares Distributed and/or Sold (in shares)         (201,238) (201,009)    
Shares, end of period (in shares)         38,786,969 37,961,316 37,925,625  
Incremental Shares From Assumed Conversion of Dilutive Stock Options, Restricted Stock, and Shares of Common Stock in Rabbi Trust         0 0    
Number of Antidilutive Stock Options, Shares of Restricted Stock and Shares of Common Stock in Rabbi Trust excluded from Dilutive Loss per Share         15,619,276 14,218,319    
Payment of withholding taxes due by Clayton Williams shareholders (in shares)         720,000      
Proceeds from issuance of common limited partners units         $ 312 $ 299 $ 0  
Accumulated Other Comprehensive Loss                
Shareholders Equity, Beginning Balance         9,600 10,370 10,325  
Realized Amounts Reclassified Into Earnings         5 5 63  
Unrealized Change in Fair Value         (4) (3) (6)  
Shareholders Equity, Ending Balance         $ 10,619 $ 9,600 $ 10,370  
Effective income tax rate applied to AOCI (in hundredths)         35.00% 35.00% 35.00%  
Noble Midstream                
Treasury stock [Rollforward]                
Shares issued (in shares) 3,680,000 3,525,000   14,375,000        
Proceeds from issuance of common limited partners units $ 174 $ 138   $ 299        
Clayton Williams Energy                
Common stock shares issued [Rollforward]                
Stock issued (shares)     56,000,000          
Clayton Williams Energy | Restricted Stock                
Treasury stock [Rollforward]                
Awarded (in shares)         1,900,000      
Non-controlling Interests                
Accumulated Other Comprehensive Loss                
Shareholders Equity, Beginning Balance         $ 312 $ 0 $ 0  
Shareholders Equity, Ending Balance         683 312 0  
Interest Rate Cash Flow Hedges                
Accumulated Other Comprehensive Loss                
Shareholders Equity, Beginning Balance         (21) (22) (23)  
Realized Amounts Reclassified Into Earnings         1 1 1  
Unrealized Change in Fair Value         0 0 0  
Shareholders Equity, Ending Balance         (20) (21) (22)  
Pension- Related and Other                
Accumulated Other Comprehensive Loss                
Shareholders Equity, Beginning Balance         (10) (11) (67)  
Realized Amounts Reclassified Into Earnings         4 4 62  
Unrealized Change in Fair Value         (4) (3) (6)  
Shareholders Equity, Ending Balance         (10) (10) (11)  
AOCI Including Portion Attributable to Noncontrolling Interest                
Accumulated Other Comprehensive Loss                
Shareholders Equity, Beginning Balance         (31) (33) (90)  
Shareholders Equity, Ending Balance         (30) $ (31) $ (33)  
Subsequent Event                
Treasury stock [Rollforward]                
Share repurchase program authorized amount               $ 750
Interest Rate Contract                
Accumulated Other Comprehensive Loss                
Loss on derivative         $ 20