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Income Per Share Attributable to Noble Energy (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of earnings per share The following table summarizes the calculation of basic and diluted income (loss) per share:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(millions, except per share amounts)
2018
 
2017
 
2018
 
2017
Net Income (Loss) and Comprehensive Income (Loss) Attributable to Noble Energy
$
227

 
$
(136
)
 
$
758

 
$
(1,612
)
Weighted Average Number of Shares Outstanding, Basic
482

 
487

 
484

 
464

Incremental Shares from Assumed Conversion of Dilutive Stock Options, Restricted Stock, and Shares of Common Stock in Rabbi Trust
2

 
—

 
2

 
—

Weighted Average Number of Shares Outstanding, Diluted
484

 
487

 
486

 
464

Income (Loss) Per Share, Basic
$
0.47

 
$
(0.28
)
 
$
1.57

 
$
(3.47
)
Income (Loss) Per Share, Diluted
0.47

 
(0.28
)
 
1.56

 
(3.47
)
Number of Antidilutive Stock Options, Shares of Restricted Stock, and Shares of Common Stock in Rabbi Trust Excluded from Calculation Above
13

 
16

 
14

 
16