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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Employee Benefit Plans (Textual)        
Gain arising during the period related to plan amendments $ 0 $ 0 $ 328 $ 0
Pension Plan, Defined Benefit [Member]
        
Components of net periodic benefit cost:        
Service cost 34 35 105 105
Interest cost 21 23 65 69
Expected return on plan assets (33) (31) (99) (93)
Amortization of:        
Net actuarial loss 14 8 43 25
Prior service cost (credit) (5) 1 (14) 2
Net periodic benefit cost 31 36 100 108
Employee Benefit Plans (Textual)        
Decrease in liability related to plan amendments     328  
Gain arising during the period related to plan amendments     328  
Decrease in expected employer contributions     100  
Expected future employer contributions to defined benefit plans     45  
Contributions to pension plans     23 137
Other Postretirement Benefit Plan, Defined Benefit [Member]
        
Components of net periodic benefit cost:        
Service cost 3 3 9 9
Interest cost 4 5 13 16
Expected return on plan assets 0 0 0 0
Amortization of:        
Net actuarial loss 0 0 0 0
Prior service cost (credit) (4) (6) (10) (17)
Net periodic benefit cost 3 2 12 8
Employee Benefit Plans (Textual)        
Contributions to pension plans     $ 13 $ 14