Net Income per Limited Partner Unit Table - Income Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended			6 Months Ended			12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019		Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 672	$ 1,209	[1]	$ (292)	$ 2,327	[1]	$ 4,825	$ 3,420
Less: Net income attributable to noncontrolling interests		306	317	[1]	185	614	[1]
Less: Net income attributable to redeemable noncontrolling interests		13	13	[1]	25	26	[1]
Income from continuing operations, net of noncontrolling interest		353	879	[1]	(502)	1,687	[1]
Less: General Partner’s interest in income (loss)		0	1	[1]	(1)	2	[1]
Limited Partners’ interest in net income (loss)		$ 353	$ 878	[1]	$ (501)	$ 1,685	[1]
Basic Income from Continuing Operations per Limited Partner Unit:
Weighted average limited partner units		2,694.9	2,621.2	[1]	2,693.3	2,620.3	[1]
Basic income (loss) per Limited Partner unit		$ 0.13	$ 0.33	[1]	$ (0.19)	$ 0.64	[1]
Diluted Income from Continuing Operations per Limited Partner Unit:
Dilutive effect of equity-based compensation of subsidiaries (1)	[2]	$ 0	$ 0	[1]	$ 0	$ 0	[1]
Net Income (Loss) Available to Common Stockholders, Diluted		$ 353	$ 878		$ (501)	$ 1,685
Dilutive effect of unvested unit awards (1)		0.9	9.8	[1]	0.0	9.8	[1]
Weighted average limited partner units, assuming dilutive effect of unvested unit awards		2,695.8	2,631.0	[1]	2,693.3	2,630.1	[1]
Diluted income (loss) from per Limited Partner unit		$ 0.13	$ 0.33	[1]	$ (0.19)	$ 0.64	[1]

[1] *As adjusted. See Note 1.

[2] Dilutive effects are excluded from the calculation for periods where the impact would have been antidilutive.