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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.