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Additional Shareholders' Equity Information (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule Of Activity In Shares Of Common And Treasury Stock Activity in shares of our common stock and treasury stock was as follows:
 
 
Year Ended December 31,
 
 
2018
 
2017
Shares of Common Stock Issued
 
 

 
 

Shares, Beginning of Period
 
528,743,381

 
471,360,427

Exercise of Common Stock Options
 
576,617

 
382,882

Restricted Stock Awarded, Net of Forfeitures (1)
 
2,488,363

 
2,912,936

Purchase and Retirement of Common Stock (2)
 
(10,008,128
)
 
—

Shares Exchanged in Clayton Williams Energy Acquisition
 
(745,232
)
 
54,087,136

Shares, End of Period
 
521,055,001

 
528,743,381

Treasury Stock
 
 
 
 
Shares, Beginning of Period
 
38,786,969

 
37,961,316

Shares Received in Payment of Withholding Taxes Due on Vesting of Shares of Restricted Stock (3)
 
267,258

 
1,026,891

Rabbi Trust Shares Distributed and/or Sold
 
(202,239
)
 
(201,238
)
Shares, End of Period
 
38,851,988

 
38,786,969

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

 
—

Number of Antidilutive Stock Options, Shares of Restricted Stock and Shares of Common Stock in Rabbi Trust excluded from Dilutive Earnings (Loss) per Share (4)
 
15,004,591

 
15,619,276


(1) 
The 2017 amount includes approximately 1.9 million shares of restricted stock awarded to former holders of Clayton Williams Energy outstanding stock awards as part of the Clayton Williams Energy Acquisition.
(2) 
On February 15, 2018, we announced that the Company's Board of Directors had authorized a share repurchase program of $750 million which expires December 31, 2020. These shares were repurchased and retired at an average price of $29.49 per share.
(3) 
The 2017 amount includes approximately 720,000 shares of common stock received from Clayton Williams Energy shareholders for the payment of withholding taxes due on the vesting of Clayton Williams Energy restricted shares and options pursuant to the purchase and sale agreement.
(4) 
For the years ended December 31, 2018 and 2017, all outstanding options and non-vested restricted shares have been excluded from the calculation of diluted earnings (loss) per share as Noble Energy incurred a loss. Therefore, inclusion of outstanding options and non-vested restricted shares in the calculation of diluted earnings (loss) per share would be anti-dilutive.
Accumulated other comprehensive income (loss) in the shareholders' equity section of the balance sheet AOCL in the shareholders’ equity section of the balance sheet included:
(millions)
 
Interest Rate 
Cash Flow
Hedge
 
Other Postretirement Benefit Plans
 
Total
December 31, 2015
 
$
(22
)
 
$
(11
)
 
$
(33
)
Realized Amounts Reclassified Into Earnings
 
1

 
4

 
5

Unrealized Change in Fair Value
 
—

 
(3
)
 
(3
)
December 31, 2016
 
(21
)
 
(10
)
 
(31
)
Realized Amounts Reclassified Into Earnings
 
1

 
4

 
5

Unrealized Change in Fair Value
 
—

 
(4
)
 
(4
)
December 31, 2017
 
(20
)
 
(10
)
 
(30
)
Realized Amounts Reclassified Into Earnings
 
(3
)
 
1

 
(2
)
Unrealized Change in Fair Value
 
—

 
—

 
—

December 31, 2018
 
$
(23
)
 
$
(9
)
 
$
(32
)