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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows from Operating Activities |  |  |
Net cash provided by operating activities | $ 1,703 | $ 1,705 | $ 1,629
Cash Flows from Investing Activities |  |  |
Proceeds from DB SERP investments | 146 | 0 | 0
Net cash used in investing activities | (2,606) | (1,868) | (1,915)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of debt | 2,767 | 1,633 | 1,049
Issuance of common stock | 41 | 83 | 72
Retirement of long-term debt | (1,870) | (980) | (728)
Debt prepayment costs | (36) | (22) | (18)
Payment of dividends on common stock | (407) | (377) | (347)
Net cash provided by financing activities | 874 | 110 | 255
Net Decrease in Cash and Cash Equivalents, Including Restricted Amounts | (29) | (53) | (31)
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period | 204 | 257 | 288
Cash and Cash Equivalents, Including Restricted Amounts, End of Period | 175 | 204 | 257
CMS Energy |  |  |
Cash Flows from Operating Activities |  |  |
Net cash provided by operating activities | 702 | 433 | 422
Cash Flows from Investing Activities |  |  |
Investment in subsidiaries | (363) | (447) | (275)
Proceeds from DB SERP investments | 22 | 0 | 0
Net cash used in investing activities | (341) | (447) | (275)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of debt | 560 | 799 | 603
Issuance of common stock | 41 | 83 | 72
Retirement of long-term debt | (675) | (425) | (530)
Debt prepayment costs | (16) | (18) | (18)
Payment of dividends on common stock | (405) | (375) | (345)
Debt issuance costs and financing fees | (8) | (3) | (5)
Change in notes payable - intercompany | 142 | (47) | 76
Net cash provided by financing activities | (361) | 14 | (147)
Net 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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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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