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Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Gross goodwill			$ 26,637		$ 27,151
Accumulated impairment losses			(6,786)		(5,186)
Goodwill			19,851	$ 21,451	21,965
Divestitures				(514)
Transfer			0	0
Impairments			(1,600)
Natural Gas Pipelines Regulated
Goodwill [Line Items]
Gross goodwill			15,892		15,892
Accumulated impairment losses			(1,643)		(1,643)
Goodwill			14,249	14,249	14,249
Divestitures				0
Transfer			0	0
Impairments			0
Natural Gas Pipelines Non-regulated
Goodwill [Line Items]
Gross goodwill			4,940		5,812
Accumulated impairment losses			(2,597)		(1,597)
Goodwill			2,343	3,343	4,215
Divestitures				(422)
Transfer			0	(450)
Impairments		$ (1,000)	(1,000)
CO2
Goodwill [Line Items]
Gross goodwill			1,528		1,528
Accumulated impairment losses			(600)		0
Goodwill			928	1,528	1,528
Divestitures				0
Transfer			0	0
Impairments	$ (600)		(600)
Products Pipelines
Goodwill [Line Items]
Gross goodwill			2,575		2,125
Accumulated impairment losses			(1,197)		(1,197)
Goodwill			1,378	1,378	928
Divestitures				0
Transfer			0	450
Impairments			0
Products Pipelines Terminals
Goodwill [Line Items]
Gross goodwill			221		221
Accumulated impairment losses			(70)		(70)
Goodwill			151	151	151
Divestitures				0
Transfer			0	0
Impairments			0
Terminals
Goodwill [Line Items]
Gross goodwill			1,481		1,573
Accumulated impairment losses			(679)		(679)
Goodwill			802	802	$ 894
Divestitures				(92)
Transfer			0	0
Impairments			$ 0
KML and U.S. Portion of Cochin Pipeline System
Goodwill [Line Items]
Divestitures				$ (514)

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