Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net Income	$ 715,883	$ 551,636
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	320,103	264,176
Allowance for equity funds used during construction (equity AFUDC)	(22,926)	(78,337)
Regulatory credit resulting from Tax Reform	(19,244)	(20,867)
Equity in (earnings) losses of unconsolidated affiliates	(2,441)	(497)
Distribution from unconsolidated affiliates	3,744	1,751
Changes in operating assets and liabilities:
Receivables - affiliates	(25)	388
Receivables - trade and other	(26,239)	19,236
Transportation and exchange gas receivable	259	1,536
Inventories	6,584	(16,132)
Payables - affiliates	3,781	(1,235)
Payables - trade	(21,844)	(57,502)
Accrued liabilities	(18,575)	968
Reserve for rate refunds	130,752	0
Asset retirement obligations - non-current	7,615	21,545
Deferred revenue	(7,922)	(7,922)
Other, net	15,264	(11,222)
Net cash provided by operating activities	1,084,769	667,522
Cash flows from financing activities:
Proceeds from long-term debt	0	993,440
Proceeds from other financing obligations	35,709	29,188
Retirement of long-term debt	0	250,000
Payments on other financing obligations	(12,581)	(1,151)
Payments for debt issuance costs	0	(10,043)
Cash distributions to parent	(559,000)	(290,000)
Cash contributions from parent	0	340,000
Advances from affiliate, net	169,908	0
Net cash provided by (used in) financing activities	(365,964)	811,434
Cash flows from investing activities:
Capital expenditures	(702,634)	(1,982,386)
Contributions and advances for construction costs	22,690	393,130
Disposal of property, plant and equipment, net	(37,014)	(21,284)
Advances to affiliate, net	33,034	150,431
Contribution to unconsolidated affiliate	(12,250)	0
Purchase of ARO Trust investments	(52,272)	(44,492)
Proceeds from sale of ARO Trust investments	29,641	25,964
Other, net	0	(319)
Net cash used in investing activities	(718,805)	(1,478,956)
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	(686,270)	(1,803,610)
Changes in related accounts payable and accrued liabilities	(16,364)	(178,776)
Capital expenditures	$ (702,634)	$ (1,982,386)

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The cash outflow for loan and debt issuance costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

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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- 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

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- 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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- 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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- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

+ 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
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- Definition

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

+ References

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- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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- 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))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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