Income Taxes - Federal Income Tax Reform (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2018
Income Taxes [Line Items]
Federal and state excess deferred income taxes		$ 23.6
Public Service Company of New Mexico
Income Taxes [Line Items]
Federal and state excess deferred income taxes		14.4
TNMP
Income Taxes [Line Items]
Federal and state excess deferred income taxes		$ 9.2
NMPRC
Income Taxes [Line Items]
Proposed term for providing benefits to customers related to reduction in state corporate tax	3 years		23 years