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Retirement, Postretirement And Other Benefit Plans (Summary Of Restricted Stock And RSU Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Stock-Settled Restricted Stock, RSUs and PSUs    
Number of Shares    
Unvested at beginning of period (in shares) 3,043,451 3,384,297
Vested / unsettled awards at beginning of period (in shares) 243,335 39,626
Forfeited/cancelled (in shares) (144,615) (276,627)
Vested/settled award (in shares) (1,390,151) (1,633,599)
Vested / unsettled awards (in shares) (246,057) (243,335)
Unvested at end of period (in shares) 2,529,441 3,043,451
Weighted Average Grant Date Value    
Unvested at beginning of period (in dollars per share) $ 37.70 $ 45.55
Vested / unsettled awards at beginning of period (in dollars per share) 45.09 46.10
Forfeited/cancelled (in dollars per share) 36.41 38.61
Vested/settled award (in dollars per share) 40.92 45.28
Vested / settled awards (in dollars per share) 46.10 40.46
Unvested at end of period (in dollars per share) $ 37.55 $ 37.70
Stock-Settled PSUs    
Number of Shares    
PSUs - granted to employees (in shares) 194,979 284,640
PSUs - adjustments for performance versus targets (in shares) (30,758) 19,938
Weighted Average Grant Date Value    
PSUs - granted to employee (in dollars per share) $ 41.67 $ 32.80
PSUs - adjustments for performance versus targets (in dollars per share) $ 47.76 $ 42.21
Cash-Settled Restricted Stock, RSUs and PSUs    
Number of Shares    
Unvested at beginning of period (in shares) 12,072 9,623
Vested / unsettled awards at beginning of period (in shares) 0 0
Forfeited/cancelled (in shares) 0 0
Vested/settled award (in shares) (5,507) (5,047)
Vested / unsettled awards (in shares) 0 0
Unvested at end of period (in shares) 15,071 12,072
Weighted Average Grant Date Value    
Unvested at beginning of period (in dollars per share) $ 37.81 $ 44.97
Vested / unsettled awards at beginning of period (in dollars per share) 0.00 0.00
Forfeited/cancelled (in dollars per share) 0.00 0.00
Vested/settled award (in dollars per share) 39.42 44.83
Vested / settled awards (in dollars per share) 0.00 0.00
Unvested at end of period (in dollars per share) $ 42.22 $ 37.81
Cash-Settled PSUs    
Number of Shares    
PSUs - granted to employees (in shares) 0 0
PSUs - adjustments for performance versus targets (in shares) 0 0
Weighted Average Grant Date Value    
PSUs - granted to employee (in dollars per share) $ 0.00 $ 0.00
PSUs - adjustments for performance versus targets (in dollars per share) $ 0.00 $ 0.00
Employees | Stock-Settled RSUs    
Number of Shares    
RSUs - granted (in shares) 826,634 1,429,554
Weighted Average Grant Date Value    
RSUs - granted (in dollars per share) $ 41.30 $ 30.32
Employees | Cash-Settled RSUs    
Number of Shares    
RSUs - granted (in shares) 0 0
Weighted Average Grant Date Value    
RSUs - granted (in dollars per share) $ 0.00 $ 0.00
Director | Stock-Settled RSUs    
Number of Shares    
RSUs - granted (in shares) 32,623 38,957
Weighted Average Grant Date Value    
RSUs - granted (in dollars per share) $ 46.03 $ 33.37
Director | Cash-Settled RSUs    
Number of Shares    
RSUs - granted (in shares) 8,506 7,496
Weighted Average Grant Date Value    
RSUs - granted (in dollars per share) $ 46.66 $ 33.35