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Pension and Postretirement Benefit Plans (Components of net periodic benefit cost and other information) (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Qualified and Non-qualified Pension Benefits
 
Benefit Plan Information  
Company contributions $ 40
Postretirement Benefits
 
Benefit Plan Information  
Company contributions $ 2