v2.4.0.6
Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2013
Employee Benefits and Other Expenses (Tables) [Abstract]  
Components of Net Periodic Benefit Cost
             
       2013  2012
      Pension benefits  Pension benefits 
       Non-Other  Non-Other
(in millions)Qualifiedqualifiedbenefits Qualifiedqualifiedbenefits
Quarter ended March 31,    
Service cost $ - - 3  - - 3
Interest cost   113 7 12  128 8 15
Expected return on plan assets  (171) - (9)  (162) - (9)
Amortization of net actuarial loss  42 4 -  33 3 -
Amortization of prior service credit  - - (1)  - - (1)
Settlement  - 4 -  1 - -
 Net periodic benefit cost (income)$ (16) 15 5  - 11 8