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Other Income and Expense - Other Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of other expense [Line Items]        
Gain (Loss) on Disposition of Assets     $ (34) $ (26)
Other Expenses $ 47 $ 13 95 42
Other Expense [Member]        
Schedule of other expense [Line Items]        
Gain (Loss) on Disposition of Assets 16 12 54 26
Water Rights Write-Off 15 0 18 7
Allowance for other receivables 15 0 15 0
Legal settlement 1 1 2 5
Other Nonoperating Expense 0 0 6 4
Other Expenses $ 47 $ 13 $ 95 $ 42