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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net income $ 588.0 $ 578.0 $ 552.0
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 656.0 607.0 566.0
Deferred income taxes 2.0 97.0 24.0
Allowance for equity funds used during construction (35.0) (22.0) (56.0)
Provision for bad debts 24.0 17.0 16.0
Net realized and unrealized hedging and derivative transactions (14.0) 62.0 (6.0)
Changes in operating assets and liabilities:      
Accounts receivable (51.0) (22.0) (43.0)
Accrued unbilled revenues (5.0) 20.0 (18.0)
Inventories (27.0) (27.0) (20.0)
Prepayments and other (8.0) (29.0) 13.0
Accounts payable (14.0) (44.0) 69.0
Net regulatory assets and liabilities 58.0 35.0 (15.0)
Other current liabilities 45.0 0.0 (13.0)
Pension and other employee benefit obligations (41.0) (47.0) (44.0)
Other, net (4.0) 3.0 (17.0)
Net cash provided by operating activities 1,174.0 1,228.0 1,008.0
Investing activities      
Utility capital/construction expenditures (1,671.0) (1,691.0) (1,577.0)
Investments in utility money pool arrangement (122.0) (641.0) (634.0)
Repayments from utility money pool arrangement 122.0 641.0 654.0
Net cash used in investing activities (1,671.0) (1,691.0) (1,557.0)
Financing activities      
Proceeds from (repayments of) short-term borrowings, net 136.0 (307.0) 307.0
Borrowings under utility money pool arrangement 1,189.0 100.0 780.0
Repayments under utility money pool arrangement (1,171.0) (61.0) (780.0)
Proceeds from issuance of long-term debt 735.0 928.0 691.0
Repayments of long-term debt (400.0) (400.0) (300.0)
Capital contributions from parent 856.0 638.0 252.0
Dividends paid to parent (831.0) (457.0) (375.0)
Net cash provided by financing activities 514.0 441.0 575.0
Net change in cash and cash equivalents 17.0 (22.0) 26.0
Cash and cash equivalents at beginning of period 11.0 33.0 7.0
Cash and cash equivalents at end of period 28.0 11.0 33.0
Supplemental disclosure of cash flow information:      
Cash paid for interest (net of amounts capitalized) (211.0) (209.0) (187.0)
Cash paid for income taxes, net (23.0) (5.0) (116.0)
Supplemental disclosure of non-cash investing and financing transactions:      
Accrued property, plant and equipment additions 197.0 234.0 142.0
Inventory transfers to property, plant and equipment 35.0 32.0 37.0
Operating lease right-of-use assets 14.0 654.0 0.0
Allowance for equity funds used during construction $ 35.0 $ 22.0 $ 56.0