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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Employee Benefit Plans (Textual)    
Decrease in liability related to plan amendments $ 328  
Gain arising during the period related to plan amendments 328 0
Pension Plans, Defined Benefit [Member]
    
Components of net periodic benefit cost:    
Service cost 36 35
Interest cost 22 23
Expected return on plan assets (32) (31)
Amortization of:    
Prior service cost (credit) (3) 1
Net actuarial loss 14 8
Net periodic benefit cost 37 36
Employee Benefit Plans (Textual)    
Decrease in expected employer contributions 100  
Expected future employer contributions to defined benefit plans 45  
Contributions to pension plans 8 10
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Components of net periodic benefit cost:    
Service cost 3 3
Interest cost 4 5
Expected return on plan assets 0 0
Amortization of:    
Prior service cost (credit) (3) (5)
Net actuarial loss 0 0
Net periodic benefit cost 4 3
Employee Benefit Plans (Textual)    
Contributions to pension plans $ 4 $ 4