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Retirement Plans (Schedule Of Net Periodic Benefit Cost And Other Comprehensive Income For Pension And Other Postretirement Benefit Plans) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 37 $ 33 $ 43
Interest cost 60 58 58
Expected return on plan assets (42) (36) (35)
Curtailment and settlement expense     5
Recognition of net actuarial loss (gain) 32 27 45
Recognition of prior service cost 3 3 3
Total net periodic benefit cost 90 85 119
Actuarial loss (gain) arising in current year 23 50 (66)
Prior service cost (credit) arising in current year   4  
Recognition of net actuarial loss, including settlement expense, in net periodic benefit cost (32) (27) (45)
Recognition of prior service cost, including curtailment, in net periodic benefit cost (3) (3) (8)
Total other comprehensive (loss) earnings (12) 24 (119)
Total recognized 78 109  
Other Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 1 1
Interest cost 2 3 3
Curtailment and settlement expense (3)    
Recognition of net actuarial loss (gain)     (1)
Recognition of prior service cost (2) 1 2
Total net periodic benefit cost (2) 5 5
Actuarial loss (gain) arising in current year (7) 1 7
Prior service cost (credit) arising in current year 5 (22)  
Recognition of net actuarial loss, including settlement expense, in net periodic benefit cost 3   1
Recognition of prior service cost, including curtailment, in net periodic benefit cost 2 (1) (2)
Total other comprehensive (loss) earnings 3 (22) 6
Total recognized $ 1 $ (17) $ 11