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Other Income and Expense - Other Income (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 Nonoperating Income (Expense) [Line Items]        
Gain (Loss) on Disposition of Assets     $ (12) $ (8)
Allowance for Funds Used During Construction, Capitalized Interest $ 3 $ 1 7 2
Other Nonoperating Income 6 6 13 15
Other Income 15 33 31 45
Other Income [Member]        
Schedule of Other Nonoperating Income (Expense) [Line Items]        
Gain (Loss) on Disposition of Assets 6 8 11 10
Altai [Domain]        
Schedule of Other Nonoperating Income (Expense) [Line Items]        
Reversal Of Legal Contingency $ 0 $ 18 $ 0 $ 18