Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
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- Definition

Length Of Natural Gas Pipeline

+ References

No definition available.

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- Definition

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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-Publisher FASB
-Name Accounting Standards Codification
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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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-Section 45
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- Definition

Amount of financial support committed by investment company to investee that is contractually required.

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-Name Accounting Standards Codification
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-Section 50
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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Other Non-Current Assets - Equity Method Investments (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) mi	Dec. 31, 2017 USD ($)	May 31, 2018 USD ($)
Investment [Line Items]
Equity method investment	$ 94,000,000	$ 64,000,000
Accounts receivable—related party	4,000,000	2,000,000
Midship Holdings [Member]
Investment [Line Items]
Equity method investment	85,000,000	55,000,000
O&M Services [Member] \| Midship Pipeline [Member] \| Service Agreements [Member]
Investment [Line Items]
Other—related party	12,000,000	3,000,000
Accounts receivable—related party	$ 4,000,000	$ 2,000,000
CCL [Member] \| Midship Pipeline [Member] \| Natural Gas Transportation Agreement [Member]
Investment [Line Items]
Long-term Purchase Commitment, Period	10 years
Midship Pipeline [Member]
Investment [Line Items]
Length of Natural Gas Pipeline \| mi	200
Midship Pipeline [Member] \| CCL [Member] \| Midship Pipeline Letter of Credit [Member]
Investment [Line Items]
Letter of Credit, Maximum Borrowing Capacity			$ 16,000,000
Letters of credit issued	$ 0
EIG [Member] \| Maximum [Member]
Investment [Line Items]
Investment Company, Financial Commitment to Investee, Future Amount	$ 500,000,000