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Income Per Share Attributable to Noble Energy (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
(millions, except per share amounts)
2018
 
2017
 
2018
 
2017
Net (Loss) Income and Comprehensive (Loss) Income Attributable to Noble Energy
$
(23
)
 
$
(1,512
)
 
$
531

 
$
(1,476
)
Weighted Average Number of Shares Outstanding, Basic
484

 
472

 
485

 
452

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

 
—

 
2

 
—

Weighted Average Number of Shares Outstanding, Diluted
484

 
472

 
487

 
452

(Loss) Income Per Share, Basic
$
(0.05
)
 
$
(3.20
)
 
$
1.09

 
$
(3.27
)
(Loss) Income Per Share, Diluted
(0.05
)
 
(3.20
)
 
1.09

 
(3.27
)
Number of Antidilutive Stock Options, Shares of Restricted Stock, and Shares of Common Stock in Rabbi Trust Excluded from Calculation Above
14

 
16

 
14

 
15