Investment in Equity Method Affiliate - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Amount billed associated with service agreements	$ 648	$ 795
Return on investment in equity method affiliate	6	3
Return of investment in equity method affiliate	$ 4	9
SESH
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Percentage of distributions through limited partner interest	50.00%
Return on investment in equity method affiliate	$ 6	3
Return of investment in equity method affiliate	4	9
SESH \| Equity Method Investee \| Shared Operations Service Agreements
Schedule of Equity Method Investments [Line Items]
Amount billed associated with service agreements	$ 6	$ 3

Limited Partners' Capital Account, Third Party Rights to Purchase Partnership Interest, Minimum Distribution Percentage

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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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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