Derivative Instruments - Interest-Rate Derivatives Table (Detail) - Not Designated as Hedging Instrument [Member] $ in Millions	6 Months Ended
Jun. 30, 2019 USD ($)
Interest-Rate Swap 1 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 550
Reference Period Start Date	Sep. 15, 2016
Reference Period End Date	Sep. 15, 2046
Derivative, Maturity Date	Sep. 01, 2020
Weighted-average interest rate for interest-rate swap	6.418%
Interest-Rate Swap 2 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 250
Reference Period Start Date	Sep. 15, 2016
Reference Period End Date	Sep. 15, 2046
Derivative, Maturity Date	Sep. 01, 2022
Weighted-average interest rate for interest-rate swap	6.809%
Interest-Rate Swap 3 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 100
Reference Period Start Date	Sep. 15, 2017
Reference Period End Date	Sep. 15, 2047
Derivative, Maturity Date	Sep. 01, 2020
Weighted-average interest rate for interest-rate swap	6.891%
Interest-Rate Swap 4 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 250
Reference Period Start Date	Sep. 15, 2017
Reference Period End Date	Sep. 15, 2047
Derivative, Maturity Date	Sep. 01, 2021
Weighted-average interest rate for interest-rate swap	6.57%
Interest-Rate Swap 5 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 450
Reference Period Start Date	Sep. 15, 2017
Reference Period End Date	Sep. 15, 2047
Derivative, Maturity Date	Sep. 01, 2023
Weighted-average interest rate for interest-rate swap	6.445%
WES [Member] \| Interest-Rate Swap 6 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 375
Reference Period Start Date	Dec. 31, 2019
Reference Period End Date	Dec. 31, 2024
Derivative, Maturity Date	Dec. 31, 2019
Weighted-average interest rate for interest-rate swap	2.662%
WES [Member] \| Interest Rate Swap 7 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 375
Reference Period Start Date	Dec. 31, 2019
Reference Period End Date	Dec. 31, 2029
Derivative, Maturity Date	Dec. 31, 2019
Weighted-average interest rate for interest-rate swap	2.802%
WES [Member] \| Interest Rate Swap 8 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 375
Reference Period Start Date	Dec. 31, 2019
Reference Period End Date	Dec. 31, 2049
Derivative, Maturity Date	Dec. 31, 2019
Weighted-average interest rate for interest-rate swap	2.885%

End date of the interest-rate swap reference period, in CCYY-MM-DD format.

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- Definition

Start date of the interest-rate swap reference period, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial 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.

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

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