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Benefit Plans (Net Periodic Benefit Cost) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
U.S. Defined Benefit Plans
      
Components of Net Periodic Benefit Cost:      
Service cost $ 16 $ 14 $ 8
Interest cost 46 48 33
Expected return on plan assets (64) (55) (33)
Amortization of prior service cost 5 4 4
Amortization of net loss 23 19 13
Loss on curtailment 0 0 0
Settlement gain recognized 0 0 0
Total pension cost 26 30 25
Foreign Defined Benefit Plans
      
Components of Net Periodic Benefit Cost:      
Service cost 26 18 18
Interest cost 515 509 564
Expected return on plan assets (484) (444) (509)
Amortization of prior service cost 0 0 0
Amortization of net loss 77 38 22
Loss on curtailment 0 0 5
Settlement gain recognized 0 1 0
Total pension cost $ 134 $ 122 $ 100