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Other Income and Expense - Other Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of other operating expense [Line Items]        
Gain (Loss) on Disposition of Assets     $ (12) $ (8)
Other Expenses $ 14 $ 17 34 25
Other Cost and Expense, Operating 1 5 3 6
Other Expense [Member]        
Schedule of other operating expense [Line Items]        
Gain (Loss) on Disposition of Assets 8 12 23 19
Settled Litigation [Member]        
Schedule of other operating expense [Line Items]        
Other Expenses $ 5 $ 0 $ 8 $ 0