Equity Table - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Partners' Capital Notes [Abstract]
Available-for-sale securities	$ 4			$ 13
Foreign currency translation adjustment	(62)	$ 2
Actuarial gain related to pensions and other postretirement benefits	(22)	$ (25)
AOCI attributable to equity method investments	(17)			(1)
Total AOCI, net of tax	(97)			$ (11)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	$ 38		$ 0

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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).

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Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) including portion attributable to noncontrolling interest.

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Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.

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