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Pension and Other Postretirement Benefit Plans (Change in Benefit Obligation) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
United States Pension Benefits
Dec. 31, 2013
United States Pension Benefits
Dec. 31, 2012
United States Pension Benefits
Dec. 31, 2011
United States Pension Benefits
Dec. 31, 2013
Foreign Pension Benefits
Dec. 31, 2012
Foreign Pension Benefits
Dec. 31, 2011
Foreign Pension Benefits
Jun. 30, 2011
Other Postretirement Benefits
Dec. 31, 2013
Other Postretirement Benefits
Dec. 31, 2012
Other Postretirement Benefits
Dec. 31, 2011
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                      
Benefit obligation, beginning of year   $ 4,196 $ 3,872   $ 448 $ 373     $ 477 $ 488  
Service cost   2 2 2 6 6 7   4 5 8
Interest cost   162 178 192 17 20 20   18 21 31
Plan participants’ contributions   0 0   1 1     8 9  
Actuarial loss (gain)   (420) 425   (7) 65     (31) 25  
Benefits paid, net of federal subsidy   (281) (270)   (23) (21)     (68) (64)  
Plan amendments   0 0   0 0   138 2 (2)  
Acquisitions / divestitures   0 0   0 (2)     0 0  
New plans   0 0   0 14     0 0  
Transfer of benefits 105 (105) 0   0 0     105 0  
Settlements / curtailment (gain)   (8) (11)   (6) (17)     0 (2)  
Foreign currency exchange rates   0 0   3 9     (6) (3)  
Benefit obligation, end of year 3,546 3,546 4,196 3,872 439 448 373   509 477 488
Accumulated benefit obligation, end of year $ 3,536 $ 3,536 $ 4,181   $ 424 $ 428     $ 0 $ 0