Net Income per Limited Partner Unit Table - Income Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of income from continuing operations to income from continuing operations available to limited partners [Line Items]
Less: Net income (loss) attributable to noncontrolling interests	$ (121)	$ 297
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(964)	1,118	$ 4,825	$ 3,420
Less: Net income attributable to redeemable noncontrolling interests	12	13
Net income (loss), net of noncontrolling interests	(855)	808
Less: General Partner’s interest in income (loss)	(1)	1
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic	$ (854)	$ 807
Basic Income from Continuing Operations per Limited Partner Unit:
Weighted average limited partner units	2,691.7	2,619.5
Basic income (loss) per Limited Partner unit	$ (0.32)	$ 0.31
Diluted Income from Continuing Operations per Limited Partner Unit:
Dilutive effect of equity-based compensation of subsidiaries (1)	$ 0	$ 0
Diluted income (loss) available to Limited Partners	$ (854)	$ 807
Dilutive effect of unvested unit awards (1)	0.0	8.4
Weighted average limited partner units, assuming dilutive effect of unvested unit awards	2,691.7	2,627.9
Diluted income (loss) from per Limited Partner unit	$ (0.32)	$ 0.31