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CMS Energy Corporation Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement of Comprehensive Income [Abstract] |  |  |
Net gain (loss) arising during the period, tax | $ 6 | $ (4) | $ (3)
Settlement arising during the period, tax | 0 | 0 | 0
Prior service credit adjustment, tax | 0 | 0 | 0
Amortization of net actuarial loss, tax | 2 | 1 | 1
Amortization of prior service credit, tax | 0 | 0 | 0
Unrealized gain (loss) on derivative instruments, tax | 0 | (2) | (1)
Reclassification adjustments included in net income , tax | $ 1 | $ 0 | $ 0

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