Commitments and Contingencies, Capital Commitments (Details) (Capital Commitments)	12 Months Ended
	Dec. 31, 2013
Southeast New Mexico Transmission Development [Member]
Capital Commitments [Abstract]
Number of projects for which notices to construct are anticipated	4
TUCO to Woodward District Extra High Voltage Interchange
Capital Commitments [Abstract]
Voltage capacity for transmission line (in kV)	345