v2.4.0.6
Employee Benefit Plans (Reconciliation of Changes in Benefit Obligation and Fair Value of Plan Assets) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of fair value of plan assets:      
Ending balance $ 3,519 $ 3,604  
Pension
      
Reconciliation of benefit obligation:      
Beginning balance 3,517 2,953  
Service cost 26 27 99
Interest cost 156 158 152
Actuarial loss (gain) 405 490  
Plan amendments   4  
Plan settlements (2) (16)  
Benefits paid (147) (98)  
Other, including foreign currency exchange rate changes (72) (1)  
Ending balance 3,883 3,517 2,953
Reconciliation of fair value of plan assets:      
Beginning balance 3,604 2,642  
Actual return on plan assets 83 1,024  
Employer contributions 42 57  
Benefits paid (147) (98)  
Plan settlements (2) (16)  
Other, including foreign currency exchange rate changes (61) (5)  
Ending balance 3,519 3,604 2,642
Postretirement
      
Reconciliation of benefit obligation:      
Beginning balance 154 155  
Service cost 4 4 7
Interest cost 7 8 11
Actuarial loss (gain) 15 (4)  
Plan amendments   0  
Plan settlements 0 0  
Benefits paid (6) (9)  
Other, including foreign currency exchange rate changes 0 0  
Ending balance 174 154 155
Reconciliation of fair value of plan assets:      
Beginning balance 0 0  
Actual return on plan assets 0 0  
Employer contributions 6 9  
Benefits paid (6) (9)  
Plan settlements 0 0  
Other, including foreign currency exchange rate changes 0 0  
Ending balance $ 0 $ 0 $ 0