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Retirement Plans (Schedule Of Net Periodic Benefit Cost For Pension And Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 9 $ 7 $ 25 $ 22
Interest cost 13 14 39 41
Expected return on plan assets (14) (13) (44) (40)
Amortization of prior service cost [1] 1 1 3 3
Net actuarial loss (gain) [1] 5 4 15 14
Total net periodic benefit cost [2] $ 14 13 38 40
Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Amortization of prior service cost [1] $ (1) $ (1) (1)
Net actuarial loss (gain) [1] (1)
Total net periodic benefit cost [2] $ (1) $ (1) $ (2)
[1] These net periodic benefit costs were reclassified out of other comprehensive earnings in the current period.
[2] Net periodic benefit cost is a component of general and administrative expenses in the accompanying consolidated comprehensive statements of earnings.