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Partners' Capital (Allocations of Net Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Partners' Capital [Line Items] |  |  |  |
Limited partners’ interest in net income (loss) |  |  |  | $ 124
Common Units [Member] |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |
Distributions | $ 69 | $ 68 | $ 137 | 136
Distributions in excess of income | (69) | 32 | 147 | 12
Limited partners’ interest in net income (loss) | $ 138 | $ 36 | $ (10) | $ 125

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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256 + Details
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