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Revenues and Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019
Contract With Customer, Asset And Liability [Line Items]
Contract liability, deferred revenue	$ 338	$ 179
Substantially all trade accounts receivable, net, maximum age of balances past their scheduled invoice date	30 days
Allowance for doubtful accounts receivable	$ 3	3
Minimum Volume Commitments
Contract With Customer, Asset And Liability [Line Items]
Counterparty deficiencies	62	54
Contract liability, deferred revenue	40	33
Counterparty deficiencies unbilled and uncollected	$ 22	$ 21

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- Definition

[Line Items] for Contract With Customer, Asset And Liability [Table]

+ References

No definition available.

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- Definition

Amount associated with deficiencies by counterparties of their contractual minimum commitments.

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- Definition

Amount that has yet to be billed or collected as of the balance sheet date associated with deficiencies by counterparties of their contractual minimum commitments.

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- Definition

The maximum number of days past their scheduled invoice date for substantially all of the trade accounts receivable.

+ References

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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