Reportable Segments Reportable Segments (Segment Adjusted EBITDA) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									$ 11,214	$ 9,510	$ 7,320
Depreciation, depletion and amortization									(3,147)	(2,859)	(2,554)
Interest expense, net of interest capitalized									(2,331)	(2,055)	(1,922)
Impairment losses									(74)	(431)	(1,039)
Gains (losses) on interest rate derivatives									(241)	47	(37)
Unrealized gains (losses) on commodity risk management activities									(113)	(105)	(99)
Non-cash compensation expense									5	11	(59)
Losses on extinguishments of debt									(18)	(112)	(89)
Adjusted EBITDA related to unconsolidated affiliates									79	(85)	24
Equity in earnings of unconsolidated affiliates									0	25	(223)
Impairment of investments in unconsolidated affiliates									0	0	(313)
Impairment of investments in unconsolidated affiliates									(626)	(655)	(716)
Equity in earnings of unconsolidated affiliates									302	344	144
Other, net									54	21	155
Income from continuing operations before income tax (expense) benefit									5,094	3,634	710
Income tax expense (benefit) from continuing operations									(195)	(4)	1,833
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent					$ 852	$ 1,393	$ 659	$ 726	4,899	3,630	2,543
Loss from discontinued operations									0	(265)	(177)
Net income	$ 1,350	$ 1,161	$ 1,208	$ 1,180	$ 852	$ 1,391	$ 633	$ 489	4,899	3,365	2,366
Intrastate Transportation And Storage [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									999	927	626
Depreciation, depletion and amortization									(184)	(169)	(147)
Equity in earnings of unconsolidated affiliates									18	19	(156)
Investment In Sunoco LP [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									665	638	732
Depreciation, depletion and amortization									(181)	(167)	(169)
Investment In USAC [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									420	289	0
Depreciation, depletion and amortization									(231)	(169)	0
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									98	40	187
Interstate Transportation and Storage [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									1,792	1,680	1,274
Depreciation, depletion and amortization									(387)	(334)	(254)
Equity in earnings of unconsolidated affiliates									222	227	236
Midstream [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									1,602	1,627	1,481
Depreciation, depletion and amortization									(1,066)	(1,006)	(954)
Equity in earnings of unconsolidated affiliates									20	26	20
NGL and refined products transportation and services [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									2,666	1,979	1,641
Depreciation, depletion and amortization									(613)	(466)	(401)
Equity in earnings of unconsolidated affiliates									53	64	33
Crude oil transportation and services [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA									2,972	2,330	1,379
Depreciation, depletion and amortization									(437)	(445)	(402)
Equity in earnings of unconsolidated affiliates									$ (1)	$ 6	$ 4