v2.4.0.6
Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2012
Employee Benefits and Other Expenses (Tables) [Abstract]  
Components of Net Periodic Benefit Cost
             
             
       2012  2011
      Pension benefits  Pension benefits 
       Non-Other  Non-Other
(in millions)Qualifiedqualifiedbenefits Qualifiedqualifiedbenefits
Quarter ended March 31,    
Service cost $ - - 3  1 - 3
Interest cost   128 8 15  130 9 18
Expected return on plan assets  (162) - (9)  (189) - (10)
Amortization of net actuarial loss  33 3 -  21 2 -
Amortization of prior service credit  - - (1)  - - (1)
Settlement  1 - -  2 - -
 Net periodic benefit cost (income)$ - 11 8  (35) 11 10