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Additional Shareholders' Equity Information (Tables)
 12 Months Ended
Dec. 31, 2015
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,
 
 
2015
 
2014
Common Stock Shares Issued
 
 

 
 

Shares, Beginning of Period
 
402,329,325

 
399,841,717

Exercise of Common Stock Options
 
343,145

 
1,459,490

Restricted Stock Awards, Net of Forfeitures
 
1,847,802

 
1,028,118

Public Equity Offering
 
24,150,000

 
—

Shares Exchanged in Rosetta Merger
 
41,048,240

 
—

Shares, End of Period
 
469,718,512

 
402,329,325

Treasury Stock
 
 

 
 

Shares, Beginning of Period
 
37,635,890

 
37,600,051

Shares Received From Employees in Payment of Withholding Taxes Due on Vesting of Shares of Restricted Stock
 
490,744

 
254,888

Rabbi Trust Shares Distributed and/or Sold
 
(201,009
)
 
(219,049
)
Shares, End of Period
 
37,925,625

 
37,635,890
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, 2012
 
$
(25
)
 
$
(88
)
 
$
(113
)
Realized Amounts Reclassified Into Earnings
 
1

 
12

 
13

Unrealized Change in Fair Value
 
—

 
(17
)
 
(17
)
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
)