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Additional Shareholders' Equity Information (Tables)
 12 Months Ended
Dec. 31, 2016
Additional Shareholders' Equity Information [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,
 
 
2016
 
2015
Common Stock Shares Issued
 
 

 
 

Shares, Beginning of Period
 
469,718,512

 
402,329,325

Exercise of Common Stock Options
 
954,898

 
343,145

Restricted Stock Awards, Net of Forfeitures
 
687,017

 
1,847,802

Public Equity Offering
 
—

 
24,150,000

Shares Exchanged in Rosetta Merger
 
—

 
41,048,240

Shares, End of Period
 
471,360,427

 
469,718,512

Treasury Stock
 
 

 
 

Shares, Beginning of Period
 
37,925,625

 
37,635,890

Shares Received From Employees in Payment of Withholding Taxes Due on Vesting of Shares of Restricted Stock
 
236,700

 
490,744

Rabbi Trust Shares Distributed and/or Sold
 
(201,009
)
 
(201,009
)
Shares, End of Period
 
37,961,316

 
37,925,625
Accumulated other comprehensive income (loss) in the shareholders' equity section of the balance sheet
Accumulated other comprehensive loss in the shareholders’ equity section of the balance sheet included:
 
Accumulated Other Comprehensive Loss
(millions)
 
Interest Rate
 Cash Flow
Hedges
 
Pension-
Related and
 Other
 
Total
December 31, 2013
 
$
(24
)
 
$
(93
)
 
$
(117
)
Realized Amounts Reclassified Into Earnings
 
1

 
11

 
12

Unrealized Change in Fair Value
 
—

 
15

 
15

December 31, 2014
 
(23
)
 
(67
)
 
(90
)
Realized Amounts Reclassified Into Earnings
 
1

 
62

 
63

Unrealized Change in Fair Value
 
—

 
(6
)
 
(6
)
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
)