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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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