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Commitments and Contingencies - Litigation and Rulemaking (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 21, 2011 mw
Public Utilities, Commitments And Contingencies [Line Items]
Minimum Megawatt Capacity from Coal and Oil-Fired Electric Generating Units under Jurisdiction of the Mercury and Air Toxics Standards | mw			25
Public Service Company of New Mexico [Member] | San Juan Generating Station [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Mercury Removal Rate, Percentage	99.00%	99.00%
Public Service Company of New Mexico [Member] | San Juan Generating Station [Member] | Mercury Control [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Current Annual Mercury Control Costs		$ 0.7
Public Service Company of New Mexico [Member] | San Juan Generating Station [Member] | Maximum [Member] | Mercury Control [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Contingent Estimated Annual Mercury Control Cost		$ 6.6
Public Service Company of New Mexico [Member] | Four Corners Units 4 and 5 (Coal) [Member] | Clean Air Act Lawsuit [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Litigation Settlement, Amount	$ 1.5
Litigation settlement, expected capital spend, environmental	$ 6.2
Public Utilities, Ownership Percentage	13.00%	13.00%

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- Definition

Contingent Estimated Annual Mercury Control Cost

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Current Annual Mercury Control Costs

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Litigation settlement, expected capital spend, environmental

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- Definition

Mercury Removal Rate, Percentage

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- Definition

Minimum Megawatt Capacity from Coal and Oil-Fired Electric Generating Units under Jurisdiction of the Mercury and Air Toxics Standards

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Public Utilities, Ownership Percentage

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Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

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