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Employee Benefits (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Retirement Plans [Member]
       
Components of net periodic cost for retirement plans and post-retirement plans        
Service cost $ (1) $ 16 $ 18 $ 34
Interest cost 23 25 46 50
Expected return on plan assets (31) (32) (62) (64)
Amortization of actuarial loss 8 8 16 15
Net periodic benefit cost (1) 17 18 35
Post-Retirement Plans [Member]
       
Components of net periodic cost for retirement plans and post-retirement plans        
Service cost 0 1 1 1
Interest cost 2 1 3 3
Amortization of prior service credit (1) 0 (1) 0
Net periodic benefit cost $ 1 $ 2 $ 3 $ 4