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Other Income and Expense - Other Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of other expense [Line Items]        
Gain (Loss) on Disposition of Assets     $ (19) $ (14)
Other Expenses $ 18 $ 21 48 29
Other Expense [Member]        
Schedule of other expense [Line Items]        
Legal settlement 1 4 1 4
Gain (Loss) on Disposition of Assets 9 9 38 14
Water Rights Write-Off 3 6 3 7
Other Nonoperating Expense 5 2 6 4
Other Expenses $ 18 $ 21 $ 48 $ 29