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Other Income and Expense - Other Expense (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
Other Income and Expenses [Abstract]        
Loss On Sale And Disposal Of Assets $ 12 $ 13 $ 36 $ 48
Contract Termination 0 0 7 0
Other Expense - Other 3 2 15 8
Other Expenses $ 15 $ 15 $ 58 $ 56