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Revenues and Accounts Receivable - Counterparty Deficiencies (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Contract With Customer, Asset And Liability [Line Items] |  |  |
Contract liability, deferred revenue | $ 501 | $ 354 | $ 338
Minimum Volume Commitments |  |  |
Contract With Customer, Asset And Liability [Line Items] |  |  |
Contract liability, deferred revenue | 73 | 22 |
Counterparty deficiencies unbilled and uncollected | 4 | 20 |
Counterparty deficiencies | $ 77 | $ 42 |

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- Definition [Line Items] for Contract With Customer, Asset And Liability [Table] + References No definition available. + Details
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- Definition Amount associated with deficiencies by counterparties of their contractual minimum commitments. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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- Details
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