Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Identifiable intangible assets [Abstract]
Gross Value	$ 5,891		$ 4,900
Accumulated Amortization	(1,790)		(1,749)
Carrying Value	4,101		3,151
Amortization expense	41	$ 36
Forecasted amortization expense [Abstract]
Remainder of 2022	148
2023	204
2024	212
2025	211
2026	206
NGL Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,198		614
Accumulated Amortization	(305)		(297)
Carrying Value	893		317
Amortization expense	8	6
NGL Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	449		449
Accumulated Amortization	(238)		(236)
Carrying Value	211		213
NGL Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	749		165
Accumulated Amortization	(67)		(61)
Carrying Value	682		104
Crude Oil Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,478		2,478
Accumulated Amortization	(638)		(618)
Carrying Value	1,840		1,860
Amortization expense	20	18
Crude Oil Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	2,195		2,195
Accumulated Amortization	(373)		(355)
Carrying Value	1,822		1,840
Crude Oil Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	283		283
Accumulated Amortization	(265)		(263)
Carrying Value	18		20
Natural Gas Pipelines & Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,989		1,582
Accumulated Amortization	(744)		(733)
Carrying Value	1,245		849
Amortization expense	11	10
Natural Gas Pipelines & Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,350		1,350
Accumulated Amortization	(559)		(550)
Carrying Value	791		800
Natural Gas Pipelines & Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	639		232
Accumulated Amortization	(185)		(183)
Carrying Value	454		49
Petrochemical & Refined Products Services [Member]
Identifiable intangible assets [Abstract]
Gross Value	226		226
Accumulated Amortization	(103)		(101)
Carrying Value	123		125
Amortization expense	2	$ 2
Petrochemical & Refined Products Services [Member] \| Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	181		181
Accumulated Amortization	(77)		(75)
Carrying Value	104		106
Petrochemical & Refined Products Services [Member] \| Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Gross Value	45		45
Accumulated Amortization	(26)		(26)
Carrying Value	$ 19		$ 19

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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