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PROPERTY, PLANT AND EQUIPMENT - (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 22,051,492 | $ 18,030,963 |
Accumulated depreciation and amortization | (3,702,807) | (3,264,312) |
Net property, plant and equipment | 18,348,685 | 14,766,651 |
Construction in Progress Expenditures Incurred but Not yet Paid | 544,800 | 388,300 | $ 92,400
Impairment of long-lived assets | 0 | 0 | $ 15,970
Non-Regulated Property, Plant and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation and amortization | (2,471,649) | (2,168,855) |
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 4,316,936 | 3,851,043 |
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Non-Regulated Property, Plant and Equipment [Member] | Gathering pipelines and related equipment | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 4,439,332 | 4,171,072 |
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Non-Regulated Property, Plant and Equipment [Member] | Processing and fractionation and related equipment | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 684,635 | 656,455 |
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Non-Regulated Property, Plant and Equipment [Member] | Storage and related equipment | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 54 years |  |
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 797,678 | 782,258 |
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Non-Regulated Property, Plant and Equipment [Member] | Transmission pipelines and related equipment | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 54 years |  |
Non-Regulated Property, Plant and Equipment [Member] | General plant and other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 610,013 | 547,424 |
Non-Regulated Property, Plant and Equipment [Member] | General plant and other | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |
Non-Regulated Property, Plant and Equipment [Member] | General plant and other | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 60 years |  |
Non-Regulated Property, Plant and Equipment [Member] | Construction work in process |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 1,645,663 | 797,182 |
Regulated Property Plant and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation and amortization | $ (1,231,158) | $ (1,095,457) |
Regulated Property Plant and Equipment [Member] | Natural Gas Liquids |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Average Depreciation Rate | 2.00% | 1.90% | 1.90%
Regulated Property Plant and Equipment [Member] | Natural Gas Pipelines |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Average Depreciation Rate | 2.10% | 2.10% | 2.10%
Regulated Property Plant and Equipment [Member] | Storage and related equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 9,180 | $ 8,987 |
Regulated Property Plant and Equipment [Member] | Storage and related equipment | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Regulated Property Plant and Equipment [Member] | Storage and related equipment | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 25 years |  |
Regulated Property Plant and Equipment [Member] | General plant and other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 66,507 | 61,136 |
Regulated Property Plant and Equipment [Member] | General plant and other | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |
Regulated Property Plant and Equipment [Member] | General plant and other | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 50 years |  |
Regulated Property Plant and Equipment [Member] | Construction work in process |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 1,802,946 | 1,002,018 |
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 1,552,546 | 1,475,789 |
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Regulated Property Plant and Equipment [Member] | Natural gas transmission pipelines and related equipment | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 77 years |  |
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment | $ 6,126,056 | $ 4,677,599 |
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Regulated Property Plant and Equipment [Member] | NGL transmission pipelines and related equipment | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 88 years |  |

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