Property, Plant and Equipment, Impairments (Details) $ in Millions		12 Months Ended
		Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment		$ 20	$ 41	$ 218
Total asset impairment charges		32	53	233
Proceeds from asset sales and other matters		42	122	64
NGL Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment		12	23	20
Crude Oil Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment		1	3	15
Natural Gas Pipelines & Services [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment	[1]	5	6	56
Natural Gas Pipelines & Services [Member] | Coal bed natural gas gathering system and related Val Verde treating facility [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment				37
Impairment of intangible assets				7
Total asset impairment charges				44
Proceeds from asset sales and other matters				39
Petrochemical & Refined Products Services [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment	[2]	$ 2	$ 9	127
Petrochemical & Refined Products Services [Member] | Marine transportation business [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment				113
Impairment of intangible assets				1
Total asset impairment charges				$ 114
Petrochemical & Refined Products Services [Member] | Marine transportation business [Member] | Measurement input, growth rate [Member]
Asset Impairment Charges [Abstract]
Long-lived asset, measurement input				0.022
Petrochemical & Refined Products Services [Member] | Marine transportation business [Member] | Measurement input, discount rate [Member]
Asset Impairment Charges [Abstract]
Long-lived asset, measurement input				0.087

[1] 2021 amount includes a $37 million non-cash impairment charge associated with the sale of components of our San Juan Gathering System.

[2] 2021 amount includes a non-cash impairment charge of $113 million associated with our marine transportation business.