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Schedule I - Condensed Financial Information of Registrant (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities |  |  |
Net cash provided by operating activities | $ 1,276 | $ 1,790 | $ 1,703
Cash Flows from Investing Activities |  |  |
Proceeds from DB SERP investments | 0 | 0 | 146
Net cash used in investing activities | (2,867) | (2,816) | (2,606)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of debt | 3,179 | 2,151 | 2,767
Issuance of common stock, net of issuance costs | 253 | 12 | 41
Retirement of long-term debt | (2,010) | (1,285) | (1,870)
Debt prepayment costs | (59) | (8) | (36)
Payment of dividends on common stock | (467) | (436) | (407)
Net cash provided by financing activities | 1,619 | 1,008 | 874
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts | 28 | (18) | (29)
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period | 157 | 175 | 204
Cash and Cash Equivalents, Including Restricted Amounts, End of Period | 185 | 157 | 175
CMS Energy |  |  |
Cash Flows from Operating Activities |  |  |
Net cash provided by operating activities | 507 | 697 | 702
Cash Flows from Investing Activities |  |  |
Investment in subsidiaries | (657) | (683) | (363)
Increase in notes receivable – intercompany | (307) | 0 | 0
Proceeds from DB SERP investments | 0 | 0 | 22
Net cash used in investing activities | (964) | (683) | (341)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of debt | 1,225 | 1,158 | 560
Issuance of common stock, net of issuance costs | 253 | 12 | 41
Retirement of long-term debt | (425) | (738) | (675)
Debt prepayment costs | (16) | 0 | (16)
Payment of dividends on common stock | (465) | (434) | (405)
Debt issuance costs and financing fees | (10) | (18) | (8)
Change in notes payable – intercompany | (105) | 6 | 142
Net cash provided by financing activities | 457 | (14) | (361)
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts | 0 | 0 | 0
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period | 0 | 0 | 0
Cash and Cash Equivalents, Including Restricted Amounts, End of Period | $ 0 | $ 0 | $ 0

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