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Regulatory Matters - MISO Return on Equity Complaints (Details) - FERC [Member]
Dec. 31, 2016
Return on Equity Complaint 1 [Member]  
Loss Contingencies [Line Items]  
Requested Return on Equity Filed with the FERC by Third Party 9.15%
FERC Authorized Return on Equity 10.32%
FERC Authorized Return on Equity Including Incentive Adder 10.82%
Return on Equity Complaint 2 [Member]  
Loss Contingencies [Line Items]  
Requested Return on Equity Filed with the FERC by Third Party 8.67%
Proposed Return on Equity by Federal Administrative Law Judge 9.70%
Proposed Return on Equity by Federal Administrative Law Judge Including Incentive Adder 10.20%
Maximum [Member] | Incentive Adder [Member]  
Loss Contingencies [Line Items]  
Incentive Adder for Participation in Regional Transmission Organization (Basis Points) 50