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Property, Plant and Equipment (Summary of Property, Plant and Equipment) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 18,316	$ 14,462
Less accumulated depreciation	3,677	2,275
Property, plant and equipment, net	14,639	12,187
Natural gas gathering and NGL transportation pipelines and facilities
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,926	5,178
Processing, fractionation and storage facilities
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,336	3,893
Pipelines and related assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,560	2,253
Barges and towing vessels
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Property, plant and equipment, gross	$ 620	490
Terminals and related assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,178	821
Refineries and related assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	938	0
Land, building, office equipment and other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	957	770
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 801	$ 1,057
Minimum | Natural gas gathering and NGL transportation pipelines and facilities
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Minimum | Processing, fractionation and storage facilities
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Minimum | Pipelines and related assets
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Minimum | Terminals and related assets
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Minimum | Refineries and related assets [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Minimum | Land, building, office equipment and other
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum | Natural gas gathering and NGL transportation pipelines and facilities
Property, Plant and Equipment [Line Items]
Estimated useful lives	30 years
Maximum | Processing, fractionation and storage facilities
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Maximum | Pipelines and related assets
Property, Plant and Equipment [Line Items]
Estimated useful lives	51 years
Maximum | Terminals and related assets
Property, Plant and Equipment [Line Items]
Estimated useful lives	30 years
Maximum | Refineries and related assets [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	30 years
Maximum | Land, building, office equipment and other
Property, Plant and Equipment [Line Items]
Estimated useful lives	35 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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