Consolidated Statements Of Cash Flows - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Basic		$ (0.48)	$ 0.97	[1]
OPERATING ACTIVITIES:
Net income (loss)		$ (693)	$ 3,514	[1]
Reconciliation of net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization		2,715	2,343	[1]
Deferred income taxes		159	191	[1]
Non-cash compensation expense		93	85	[1]
Impairment losses		2,803	62	[1]
Losses on extinguishments of debt		(62)	(18)	[1]
Equity in earnings of unconsolidated affiliates		(46)	(224)	[1]
Distributions from unconsolidated affiliates		176	254	[1]
Inventory valuation adjustments		126	(71)	[1]
Distributions on unvested awards		(33)	(27)	[1]
Other non-cash		(130)	33	[1]
Net change in operating assets and liabilities, net of effects of acquisitions		94	(212)	[1]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		5,455	5,966	[1]
INVESTING ACTIVITIES:
Proceeds from Divestiture of Businesses and Interests in Affiliates		0	93	[1]
Cash paid for all other acquisitions, net of cash received		0	(7)	[1]
Capital expenditures, excluding allowance for equity funds used during construction		(4,030)	(4,181)	[1]
Contributions in aid of construction costs		61	63	[1]
Contributions to unconsolidated affiliate		37	481	[1]
Distributions from unconsolidated affiliates in excess of cumulative earnings		144	40	[1]
Proceeds from the sale of other assets		10	55	[1]
Other		9	5	[1]
Net Cash Provided by (Used in) Investing Activities, Continuing Operations		(3,861)	(4,423)	[1]
FINANCING ACTIVITIES:
Proceeds from borrowings		20,651	18,125	[1]
Repayments of debt		(20,293)	(17,247)	[1]
Subsidiary equity offerings, net of issue costs		1,580	780	[1]
Distributions to partners		(2,397)	(2,300)	[1]
Debt issuance costs		(53)	(114)	[1]
Other, net		18	(3)	[1]
Distributions to noncontrolling interests		(1,282)	(1,270)	[1]
Preferred Units, Cumulative Cash Distributions		(37)	0	[1]
Capital contributions from noncontrolling interest		203	278	[1]
Net cash used in financing activities		(1,610)	(1,751)	[1]
Decrease in cash and cash equivalents		(16)	(208)	[1]
Cash and cash equivalents, beginning of period	[1]	291	419
Cash and cash equivalents, end of period		275	211	[1]
Equity Method Investment, Other than Temporary Impairment		$ 129	$ 0	[1]
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Basic		$ 0.10

[1] *As adjusted. See Note 1.