Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net Income	$ 533,947	$ 441,601
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	227,470	207,807
Allowance for equity funds used during construction (equity AFUDC)	(15,073)	(13,598)
Regulatory credit resulting from Tax Reform	(15,376)	(6,997)
Equity in earnings of unconsolidated affiliates	0	(1,594)
Distribution from unconsolidated affiliates	0	2,496
Changes in operating assets and liabilities:
Receivables - affiliates	(319)	(599)
Receivables - trade and other	38,704	(22,563)
Transportation and exchange gas receivable	(829)	(5,846)
Inventories	(8,416)	(3,671)
Payables - affiliates	5,520	5,603
Payables - trade	282,731	(20,397)
Accrued liabilities	43,104	(8,346)
Reserve for rate refunds	(188,842)	85,853
Asset retirement obligations	(23,299)	16,897
Deferred revenue	(5,282)	(5,279)
Other, net	2,191	37,518
Net cash provided by operating activities	876,231	708,885
Cash flows from financing activities:
Proceeds from long-term debt	1,195,629	0
Proceeds from other financing obligations	5,079	20,429
Payments of other financing obligations	9,786	7,944
Payments of debt issuance costs	9,790	0
Cash distributions to parent	(535,000)	(346,000)
Advances from affiliate, net	(252,549)	34,345
Net cash provided by (used in) financing activities	393,583	(299,170)
Cash flows from investing activities:
Capital expenditures	(343,234)	(412,561)
Contributions and advances for construction costs	14,852	17,481
Disposal of property, plant and equipment, net	(18,686)	(17,077)
Advances to affiliate, net	(905,827)	33,034
Payments to Pine Needle for repayment of debt	0	(12,250)
Purchase of ARO Trust investments	(45,048)	(42,632)
Proceeds from sale of ARO Trust investments	28,129	26,636
Other, net	0	(2,346)
Net cash used in investing activities	(1,269,814)	(409,715)
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	(304,167)	(446,594)
Changes in related accounts payable and accrued liabilities	(39,067)	34,033
Capital expenditures	$ (343,234)	$ (412,561)

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

+ 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
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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Namespace Prefix:	us-gaap_
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

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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

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

- Definition

Amount of cash inflow from issuance of long-term debt classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

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

- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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Period Type:	duration