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Derivative Instruments and Hedging Activities (Commodity Volumes) (Details) | Mar. 31, 2016 MW-M MWh MMBTU T bbl | [2]
--- | --- | ---
Power | Sales | 2016 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MWh | (29,118,538) | [1]
Power | Sales | 2017 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MWh | (10,103,077) |
Power | Sales | 2018 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MWh | (1,574,972) |
Power | Sales | Thereafter |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MWh | (719,594) |
Capacity | Sales | 2016 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MW-M | (5,413) | [1]
Capacity | Sales | 2017 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MW-M | (3,750) |
Capacity | Sales | 2018 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MW-M | (3,746) |
Capacity | Sales | Thereafter |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MW-M | (1,559) |
Gas | Purchases | 2016 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MMBTU | (106,721,381) | [1]
Gas | Purchases | 2017 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MMBTU | (16,519,903) |
Gas | Purchases | 2018 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MMBTU | (14,714,804) |
Gas | Purchases | Thereafter |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MMBTU | (2,518,280) |
FTRs | Purchases | 2016 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MW-M | (5,608) | [1]
FTRs | Purchases | 2017 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MW-M | (200) |
FTRs | Purchases | 2018 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MW-M | 0 |
FTRs | Purchases | Thereafter |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MW-M | 0 |
Oil | Purchases | 2016 |  |
Derivative [Line Items] |  |
Volumes (in barrels) | bbl | 48,409 | [1]
Oil | Purchases | 2017 |  |
Derivative [Line Items] |  |
Volumes (in barrels) | bbl | 0 |
Oil | Purchases | 2018 |  |
Derivative [Line Items] |  |
Volumes (in barrels) | bbl | 0 |
Oil | Purchases | Thereafter |  |
Derivative [Line Items] |  |
Volumes (in barrels) | bbl | 0 |
CRR purchase contracts | Purchases | 2016 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MWh | (1,790,525) | [1]
CRR purchase contracts | Purchases | 2017 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MWh | (641,989) |
CRR purchase contracts | Purchases | 2018 |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MWh | 0 |
CRR purchase contracts | Purchases | Thereafter |  |
Derivative [Line Items] |  |
Volumes (in MWh, MW-Month, MMBtu) | MWh | 0 |
Emission Allowances | Purchases | 2016 |  |
Derivative [Line Items] |  |
Volumes (tons) | T | 3,149,720 | [1]
Emission Allowances | Purchases | 2017 |  |
Derivative [Line Items] |  |
Volumes (tons) | T | 0 |
Emission Allowances | Purchases | 2018 |  |
Derivative [Line Items] |  |
Volumes (tons) | T | 0 |
Emission Allowances | Purchases | Thereafter |  |
Derivative [Line Items] |  |
Volumes (tons) | T | 0 |
[1] | Represents balance of the current year.
[2] | Volumes for option contracts factor in the probability of an option being exercised and may be less than the notional amount of the option.

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