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Equity Table - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Partners' Capital Notes [Abstract]
Available-for-sale securities	$ 7	$ 2
Foreign currency translation adjustment	(5)	(5)
Actuarial gain related to pensions and other postretirement benefits	(41)	(48)
AOCI attributable to equity method investments	5	9
Subtotal	(34)	(42)
Accumulated other comprehensive income, net	$ (34)	$ (42)

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Accumulated unrealized gain (loss), after tax, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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