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Equity Table - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Partners' Capital Notes [Abstract] |  |
Available-for-sale securities | $ 18 | $ 18
Foreign currency translation adjustment | 21 | 7
Actuarial gain related to pensions and other postretirement benefits | (2) | (7)
AOCI attributable to equity method investments | (23) | (14)
Total AOCI, net of tax | 14 | 4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | $ (6) | $ 2

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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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