Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net Income	$ 229,702	$ 179,916
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	104,623	83,224
Allowance for equity funds used during construction (equity AFUDC)	(6,510)	(19,782)
Regulatory credit resulting from Tax Reform	(1,749)	0
Equity in (earnings) losses of unconsolidated affiliates	(771)	1,590
Distribution from unconsolidated affiliates	1,248	429
Changes in operating assets and liabilities:
Receivables - affiliates	619	598
Receivables - trade and other	(33,047)	8,612
Transportation and exchange gas receivable	(1,824)	275
Inventories	(4,531)	(37,886)
Payables - affiliates	(4,242)	(29,496)
Payables - trade	(45,546)	(52,553)
Accrued liabilities	(13,105)	(11,473)
Asset retirement obligations - non-current	18,577	17,201
Deferred revenue	(2,638)	(2,638)
Other, net	3,419	(6,296)
Net cash provided by operating activities	244,225	131,721
Cash flows from financing activities:
Proceeds from long-term debt	0	993,440
Proceeds from other financing obligations	7,914	18,804
Payments on other financing obligations	(3,680)	(375)
Payments for debt issuance costs	0	(9,025)
Cash distributions to parent	(176,000)	(55,000)
Cash contributions from parent	0	340,000
Advances from affiliate, net	86,580	0
Net cash provided by (used in) financing activities	(85,186)	1,287,844
Cash flows from investing activities:
Property, plant and equipment additions, net of equity AFUDC	(184,556)	(737,004)
Contributions and advances for construction costs	10,057	188,543
Disposal of property, plant and equipment, net	(5,477)	(5,241)
Advances to affiliate, net	33,034	(854,125)
Purchase of ARO Trust investments	(19,518)	(15,530)
Proceeds from sale of ARO Trust investments	9,767	3,792
Other, net	(2,346)	0
Net cash used in investing activities	(159,039)	(1,419,565)
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, net of equity AFUDC	(161,741)	(721,921)
Changes in related accounts payable and accrued liabilities	(22,815)	(15,083)
Property, plant and equipment additions, net of equity AFUDC	$ (184,556)	$ (737,004)

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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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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=109223946&loc=d3e3213-108585

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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=109223946&loc=d3e3179-108585

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

- 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
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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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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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

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=109223946&loc=d3e3255-108585

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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=109223946&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=109223946&loc=d3e3291-108585

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