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Other Income and Expense - Other Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule of other operating expense [Line Items]        
Gain (Loss) on Disposition of Assets     $ (23) $ (19)
Other Expenses $ 18 $ 12 52 37
Other Cost and Expense, Operating 2 0 5 6
Other Expense [Member]        
Schedule of other operating expense [Line Items]        
Gain (Loss) on Disposition of Assets 16 12 39 31
Settled Litigation [Member]        
Schedule of other operating expense [Line Items]        
Other Expenses $ 0 $ 0 $ 8 $ 0