STATEMENTS OF CONSOLIDATED CASH FLOWS - CERC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income (loss)	$ 1,486	$ (773)	$ 791
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,316	1,189	1,225
Deferred income taxes	213	(429)	69
Goodwill impairment and loss from reclassification to held for sale	0	175	48
Changes in other assets and liabilities, excluding acquisitions:
Accounts receivable and unbilled revenues, net	(98)	90	226
Inventory	(140)	9	(52)
Taxes receivable	81	24	(106)
Accounts payable	175	2	(455)
Net regulatory assets and liabilities	(2,295)	(107)	(22)
Other operating activities, net	85	35	128
Net cash provided by operating activities	22	1,995	1,638
Cash Flows from Investing Activities:
Capital expenditures	(3,164)	(2,596)	(2,506)
Proceeds from divestitures (Note 4)	22	1,215	0
Other investing activities, net	15	36	34
Net cash used in investing activities	(1,851)	(1,265)	(8,421)
Cash Flows from Financing Activities:
Proceeds from (payments of) commercial paper, net	1,132	(761)	1,891
Proceeds from long-term debt	4,493	799	2,916
Payments of long-term debt, including make-whole premiums	(2,968)	(1,724)	(1,302)
Other financing activities, net	(5)	(6)	(14)
Net cash provided by (used in) financing activities	1,916	(834)	2,776
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	87	(104)	(4,007)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	167	271	4,278
Cash, Cash Equivalents and Restricted Cash at End of Year	254	167	271
CERC Corp
Cash Flows from Operating Activities:
Net income (loss)	254	81	212
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	326	304	293
Deferred income taxes	77	91	7
Goodwill impairment and loss from reclassification to held for sale	0	93	48
Changes in other assets and liabilities, excluding acquisitions:
Accounts receivable and unbilled revenues, net	(60)	151	252
Accounts receivable/payable–affiliated companies	(4)	4	(6)
Inventory	(54)	63	(12)
Taxes receivable	(28)	0	0
Accounts payable	76	(72)	(305)
Net regulatory assets and liabilities	(1,979)	(52)	76
Other current assets and liabilities	(11)	47	(91)
Other assets and liabilities	(45)	14	(33)
Other operating activities, net	8	5	25
Net cash provided by operating activities	(1,440)	729	466
Cash Flows from Investing Activities:
Capital expenditures	(895)	(815)	(776)
(Increase) decrease in notes receivable–affiliated companies	0	(9)	114
Proceeds from divestitures (Note 4)	22	365
Other investing activities, net	14	7	0
Net cash used in investing activities	(859)	(452)	(662)
Cash Flows from Financing Activities:
Decrease in short-term borrowings, net	(27)	0	0
Proceeds from (payments of) commercial paper, net	552	(30)	167
Proceeds from long-term debt	1,699	500	0
Payments of long-term debt, including make-whole premiums	(311)	(593)	0
Payment of debt issuance costs	(10)	(4)	0
Dividend to parent	0	(80)	(120)
Contribution from parent	180	217	129
Capital distribution to parent associated with the sale of CES	0	(286)	0
Increase (decrease) in notes payable–affiliated companies	224	0	0
Other financing activities, net	(1)	(2)	(3)
Net cash provided by (used in) financing activities	2,306	(278)	173
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	7	(1)	(23)
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	1	2	25
Cash, Cash Equivalents and Restricted Cash at End of Year	$ 8	$ 1	$ 2