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Defined Benefit Pension And Other Postretirement Plans (Components Of Net Periodic Benefit Cost) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Pension Benefits [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 15 $ 15 $ 32 $ 33
Interest cost 28 27 55 54
Expected return on plan assets (25) (24) (51) (48)
Amortization - prior service cost 2 1 4 3
Amortization - actuarial loss 22 17 46 35
Amortization - net settlement/curtailment loss 83    83  
Net periodic benefit cost 125 36 169 77
Other Benefits [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 4 10 9
Interest cost 6 7 13 14
Expected return on plan assets          
Amortization - prior service cost          
Amortization - actuarial loss          
Amortization - net settlement/curtailment loss          
Net periodic benefit cost $ 11 $ 11 $ 23 $ 23