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Retirement Plans (Schedule Of Net Periodic Benefit Cost For Pension And Postretirement Benefit Plans) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Pension Benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 7 $ 9 $ 22 $ 27
Interest cost 14 13 41 39
Expected return on plan assets (13) (16) (40) (47)
Amortization of prior service cost 1 [1] 1 [1] 3 [1] 3 [1]
Net actuarial loss (gain) 4 [1] 5 [1] 14 [1] 16 [1]
Net periodic benefit cost 13 [2] 12 [2] 40 [2] 38 [2]
Postretirement Benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost       1
Amortization of prior service cost (1) [1]   (1) [1]  
Net actuarial loss (gain)     (1) [1] (1) [1]
Net periodic benefit cost $ (1) [2]   $ (2) [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 on the accompanying comprehensive statements of earnings.