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Debt - Covenants (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |
Coverage ratio of debt-to-EBITDA, maximum | 5.00 |  |
Ratio of debt-to-EBITDA during acquisition period, maximum | 5.50 |  |
Threshold for acquisition period qualification | $ 150 |  |
Outstanding letters of credit | 129 | $ 157 |
Credit agreements and PAA commercial paper program |  |  |
Debt Instrument [Line Items] |  |  |
Total borrowings | 29,300 | 13,300 | $ 45,400
Total repayments | $ 29,000 | $ 12,900 | $ 46,300
Letters of credit | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Periods for which letters of credit are issued | 70 days |  |

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- Definition Represents the minimum acquisition amount for the debt-to-EBITDA coverage ratio covenant compliance requirement to change. + References No definition available. + Details
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- Definition Represents the maximum ratio of debt to EBITDA (earnings before interest, taxes, depreciation and amortization) required to be maintained during acquisition period under the credit agreement. + References No definition available. + Details
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- Definition Represents the maximum ratio of debt to EBITDA (earnings before interest, taxes, depreciation and amortization) required to be maintained under the credit agreement. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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. + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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