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Benefit Plans (Level 3 Roll Forward) (Details) (Foreign Defined Benefit Plans, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
CHANGE IN PLAN ASSETS:    
Fair value of plan assets as of January 1 $ 4,712 $ 4,400
Effect of foreign currency exchange rate changes (519) (365)
Fair value of plan assets as of December 31 3,605 4,712
Level 3
   
CHANGE IN PLAN ASSETS:    
Fair value of plan assets as of January 1 635 755
Returns relating to assets still held at reporting date (26) (64)
Purchases, sales and settlements, net 0 3
Effect of foreign currency exchange rate changes (79) (59)
Fair value of plan assets as of December 31 $ 530 $ 635