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Other Income and Expense - Other Income (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]        
Contract Termination $ 0 $ 0 $ 60 $ 0
Reversal Of Legal Contingency 10 0 10 0
Gain On Sale Of Assets 2 2 9 5
Insurance Proceeds 0 0 0 10
Other Income - Other 13 5 27 24
Other income $ 25 $ 7 $ 106 $ 39