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Incentive Program (Tables)
 12 Months Ended
Dec. 31, 2015
Incentive Program [Abstract]  
Summary Of Restricted Stock And Units Outstanding
2015
Weighted Average
Grant-Date
Restricted stock and units outstandingSharesFair Value per Share
(thousands)(dollars)
Issued and outstanding at January 144,439 81.45
2014 award issued in 20159,758 95.20
Vested(9,945)79.86
Forfeited(189)82.26
Issued and outstanding at December 3144,063 84.85
Grant Value Of Restricted Stock And Units
Value of restricted stock and units2015 2014 2013
Grant price (dollars)81.27 95.20 94.47
Value at date of grant:(millions of dollars)
Restricted stock and units settled in stock727 858 843
Units settled in cash60 73 76
Total value787 931 919