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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities      
Net cash provided by operating activities $ 1,790 $ 1,703 $ 1,705
Cash Flows from Investing Activities      
Proceeds from DB SERP investments 0 146 0
Net cash used in investing activities (2,816) (2,606) (1,868)
Cash Flows from Financing Activities      
Proceeds from issuance of debt 2,151 2,767 1,633
Issuance of common stock 12 41 83
Retirement of long-term debt (1,285) (1,870) (980)
Debt prepayment costs (8) (36) (22)
Payment of dividends on common stock (436) (407) (377)
Net cash provided by financing activities 1,008 874 110
Net Decrease in Cash and Cash Equivalents, Including Restricted Amounts (18) (29) (53)
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period 175 204 257
Cash and Cash Equivalents, Including Restricted Amounts, End of Period 157 175 204
CMS Energy      
Cash Flows from Operating Activities      
Net cash provided by operating activities 697 702 433
Cash Flows from Investing Activities      
Investment in subsidiaries (683) (363) (447)
Proceeds from DB SERP investments 0 22 0
Net cash used in investing activities (683) (341) (447)
Cash Flows from Financing Activities      
Proceeds from issuance of debt 1,158 560 799
Issuance of common stock 12 41 83
Retirement of long-term debt (738) (675) (425)
Debt prepayment costs 0 (16) (18)
Payment of dividends on common stock (434) (405) (375)
Debt issuance costs and financing fees (18) (8) (3)
Change in notes payable – intercompany 6 142 (47)
Net cash provided by financing activities (14) (361) 14
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