Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net Income	$ 277,984	$ 229,702
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	113,635	104,623
Allowance for equity funds used during construction (equity AFUDC)	(8,121)	(6,510)
Regulatory credit resulting from Tax Reform	(7,688)	(1,749)
Equity in earnings losses of unconsolidated affiliates	0	(771)
Distribution from unconsolidated affiliates	0	1,248
Changes in operating assets and liabilities:
Receivables - affiliates	(1,016)	619
Receivables - trade and other	20,227	(33,047)
Transportation and exchange gas receivable	697	(1,824)
Inventories	1,130	(4,531)
Payables - afilliates	(6,973)	(4,242)
Payables - trade	(31,120)	(45,546)
Accrued liabilities	(40,343)	(35,238)
Reserve for rate refunds	59,449	22,133
Asset retirement obligations	5,432	18,577
Deferred revenue	(2,641)	(2,638)
Other, net	9,572	3,419
Net cash provided by operating activities	390,224	244,225
Cash flows from financing activities:
Proceeds from other financing obligations	1,685	7,914
Payments on other financing obligations	(4,837)	(3,680)
Cash distributions to parent	(270,000)	(176,000)
Advances from affiliate, net	64,358	86,580
Net cash used in financing activities	(208,794)	(85,186)
Cash flows from investing activities:
Capital expenditures	(173,184)	(184,556)
Contributions and advances for construction costs	10,149	10,057
Disposal of property, plant and equipment, net	(4,782)	(5,477)
Advances to affiliate, net	0	33,034
Purchase of ARO Trust investments	(28,686)	(19,518)
Proceeds from sale of ARO Trust investments	15,073	9,767
Other, net	0	(2,346)
Net cash used in investing activities	(181,430)	(159,039)
Increase (decrease) in cash	0	0
Cash at beginning of period	0	0
Cash at end of period	0	0
Increase to property, plant and equipment, exclusive of equity AFUDC	(132,575)	(161,741)
Changes in related accounts payable and accrued liabilities	(40,609)	(22,815)
Capital expenditures	$ (173,184)	$ (184,556)

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for the purchase of investments that will be held in a decommissioning trust fund.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToInvestInDecommissioningFund
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from developers, builders, governmental agencies and municipalities that provide the entity with cash to extend its construction services to their properties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of assets held in a decommissioning trust fund.

+ References

+ Details

Name:	us-gaap_ProceedsFromDecommissioningFund
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow (outflow) from financing activities classified as other.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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Period Type:	duration