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Price Risk Management Future Year Net Unrealized Gain/Loss Recorded at Balance Sheet Date Expected to Become Realized (Details)
$ in Millions
Jun. 30, 2016
USD ($)
Electricity [Member]  
Commodity contracts:  
2015 $ 3
2016 6
2017 7
2018 7
2019 7
Thereafter 113
Total 143
Natural Gas [Member]  
Commodity contracts:  
2015 46
2016 34
2017 9
2018 3
2019 0
Thereafter 0
Total 92
Net Unrealized Loss [Member]  
Commodity contracts:  
2015 49
2016 40
2017 16
2018 10
2019 7
Thereafter 113
Total $ 235