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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2011
Jun. 30, 2012
Pension Plans, Defined Benefit [Member]
Jun. 30, 2011
Pension Plans, Defined Benefit [Member]
Jun. 30, 2012
Pension Plans, Defined Benefit [Member]
Jun. 30, 2011
Pension Plans, Defined Benefit [Member]
Jun. 30, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jun. 30, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jun. 30, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jun. 30, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Jul. 31, 2012
Subsequent Event [Member]
Pension Plans, Defined Benefit [Member]
Components of net periodic benefit cost:                    
Service cost   $ 35 $ 22 $ 70 $ 45 $ 3 $ 2 $ 6 $ 5  
Interest cost   23 22 46 43 6 5 11 11  
Expected return on plan assets   (31) (28) (62) (56) 0 0 0 0  
Amortization of:                    
Prior service cost (credit)   0 0 1 1 (6) (5) (11) (11)  
Net actuarial loss   9 3 17 6 0 1 0 1  
Net periodic benefit cost   36 19 72 39 3 3 6 6  
Employee Benefit Plans (Textual)                    
Contributions to pension plans $ 0     $ 13 $ 0         $ 50