Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 370	$ 341	$ 316
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	377	372	350
Deferred income taxes and investment tax credits	15	(1)	192
Allowance for equity funds used during construction	(11)	(10)	(2)
Deferred recovery clauses	63	(55)	(83)
Receivables, less allowance for uncollectibles	52	(2)	(43)
Inventories	6	4	13
Taxes accrued	1	6	(9)
Accounts payable	(4)	11	(16)
Regulatory assets and liabilities	1	98	(100)
Other	(29)	38	(6)
Cash flows from operating activities	841	802	612
Cash flows used in investing activities
Capital expenditures	(1,283)	(1,109)	(640)
Net proceeds from sale of assets	0	1	0
Cash flows used in investing activities	(1,283)	(1,108)	(640)
Cash flows from or used in financing activities
Proceeds from long-term debt issuance	292	714	0
Repayment of long-term debt	0	(304)	0
Net change in short-term debt (maturities of 90 days or less)	127	216	(165)
Proceeds from other short-term debt (maturities over 90 days)	0	0	300
Repayment of other short-term debt (maturities over 90 days)	0	(300)	0
Other financing activities	0	(1)	(2)
Cash flows from financing activities	441	308	31
Net increase (decrease) in cash and cash equivalents	(1)	2	3
Cash and cash equivalents at beginning of the year	15	13	10
Cash and cash equivalents at end of the year	14	15	13
Supplemental disclosure of cash paid (received):
Interest	134	112	115
Income taxes	63	77	13
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	17	40	(16)
TECO Energy [Member]
Cash flows from or used in financing activities
Equity contributions from TECO Energy	395	345	190
Dividends to TECO Energy	$ (373)	$ (362)	$ (292)