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SEGMENTS - Operating Segments Financial Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment     4    
Total revenues (Note L) $ 4,189 $ 5,914 $ 12,442 $ 17,355  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,799) (4,773) (8,628) (14,017)  
Operating costs (352) (286) (981) (827)  
Equity in net earnings from investments 49 39 132 111  
Other operating income (expense), net 1 2 782 9  
Segment adjusted EBITDA 1,101 906 3,780 2,658  
Depreciation and amortization (177) (157) (509) (469)  
Investments in unconsolidated affiliates 1,795 804 1,795 804 $ 802
Total assets 43,939 24,439 43,939 24,439 $ 24,379
Capital expenditures 398 327 992 886  
Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 4,817 6,927 14,236 20,467  
Cost of sales and fuel (exclusive of depreciation and operating costs) (3,426) (5,782) (10,423) (17,119)  
Operating costs (351) (286) (978) (831)  
Equity in net earnings from investments 49 39 132 111  
Noncash compensation expense and other 12 8 38 30  
Other operating income (expense), net     775    
Segment adjusted EBITDA 1,101 906 3,780 2,658  
Depreciation and amortization (176) (157) (506) (466)  
Investments in unconsolidated affiliates 1,794 804 1,794 804  
Total assets 43,582 24,271 43,582 24,271  
Capital expenditures 386 313 959 848  
Natural Gas Gathering and Processing | Natural Gas Gathering and Processing Intersegment          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 620 1,000 1,800 3,100  
Natural Gas Gathering and Processing | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 965 1,859 3,032 5,191  
Cost of sales and fuel (exclusive of depreciation and operating costs) (527) (1,461) (1,787) (4,148)  
Operating costs (119) (98) (339) (289)  
Equity in net earnings from investments 0 2 1 5  
Noncash compensation expense and other 3 2 13 12  
Other operating income (expense), net     (1)    
Segment adjusted EBITDA 322 304 919 771  
Depreciation and amortization (68) (65) (202) (193)  
Investments in unconsolidated affiliates 26 28 26 28  
Total assets 6,976 7,079 6,976 7,079  
Capital expenditures 126 104 308 321  
Natural Gas Liquids | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 3,634 4,931 10,669 14,858  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,875) (4,317) (8,597) (12,949)  
Operating costs (168) (144) (481) (416)  
Equity in net earnings from investments 17 11 39 25  
Noncash compensation expense and other 6 4 20 12  
Other operating income (expense), net     775    
Segment adjusted EBITDA 614 485 2,425 1,530  
Depreciation and amortization (85) (76) (248) (226)  
Investments in unconsolidated affiliates 417 414 417 414  
Total assets 14,988 14,987 14,988 14,987  
Capital expenditures 189 169 495 445  
Natural Gas Liquids | Natural gas liquids regulated          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 756 672 2,100 1,900  
Cost of sales and fuel (exclusive of depreciation and operating costs) (240) (205) (627) (503)  
Operating costs (93) (84) (273) (241)  
Natural Gas Liquids | Natural gas liquids regulated | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 696 621 1,900 1,700  
Natural Gas Pipelines | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 146 137 463 418  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2) (4) (17) (22)  
Operating costs (51) (44) (145) (126)  
Equity in net earnings from investments 29 26 89 81  
Noncash compensation expense and other 3 2 5 6  
Other operating income (expense), net     1    
Segment adjusted EBITDA 125 117 396 357  
Depreciation and amortization (17) (16) (50) (47)  
Investments in unconsolidated affiliates 440 362 440 362  
Total assets 2,433 2,205 2,433 2,205  
Capital expenditures 70 40 155 82  
Natural Gas Pipelines | Natural gas pipelines regulated          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 107 102 326 329  
Cost of sales and fuel (exclusive of depreciation and operating costs) (8) (12) (31) (40)  
Operating costs (42) (37) (121) (108)  
Refined Products and Crude | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 72   72    
Cost of sales and fuel (exclusive of depreciation and operating costs) (22)   (22)    
Operating costs (13)   (13)    
Equity in net earnings from investments 3   3    
Noncash compensation expense and other 0   0    
Other operating income (expense), net     0    
Segment adjusted EBITDA 40   40    
Depreciation and amortization (6)   (6)    
Investments in unconsolidated affiliates 911   911    
Total assets 19,185   19,185    
Capital expenditures 1   1    
NGL and condensate sales          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 3,449 4,734 10,159 14,246  
NGL and condensate sales | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 4,073 5,740 11,938 17,342  
NGL and condensate sales | Natural Gas Gathering and Processing | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 641 991 1,835 3,034  
NGL and condensate sales | Natural Gas Liquids | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 3,432 4,749 10,103 14,308  
NGL and condensate sales | Natural Gas Pipelines | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0 0 0 0  
NGL and condensate sales | Refined Products and Crude | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0   0    
Residue natural gas sales          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 282 827 1,094 2,065  
Residue natural gas sales | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 282 827 1,094 2,065  
Residue natural gas sales | Natural Gas Gathering and Processing | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 279 824 1,066 2,035  
Residue natural gas sales | Natural Gas Liquids | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0 0 0 0  
Residue natural gas sales | Natural Gas Pipelines | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 3 3 28 30  
Residue natural gas sales | Refined Products and Crude | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0   0    
Gathering, processing and exchange service revenue          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 186 175 523 519  
Gathering, processing and exchange service revenue | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 186 175 523 519  
Gathering, processing and exchange service revenue | Natural Gas Gathering and Processing | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 36 36 109 104  
Gathering, processing and exchange service revenue | Natural Gas Liquids | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 150 139 414 415  
Gathering, processing and exchange service revenue | Natural Gas Pipelines | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0 0 0 0  
Gathering, processing and exchange service revenue | Refined Products and Crude | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0   0    
Transportation and storage revenue          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 188 172 570 508  
Transportation and storage revenue | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 191 174 577 514  
Transportation and storage revenue | Natural Gas Gathering and Processing | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0 0 0 0  
Transportation and storage revenue | Natural Gas Liquids | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 48 40 143 127  
Transportation and storage revenue | Natural Gas Pipelines | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 143 134 434 387  
Transportation and storage revenue | Refined Products and Crude | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0   0    
Other          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 84 6 96 17  
Other | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 85 11 104 27  
Other | Natural Gas Gathering and Processing | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 9 8 22 18  
Other | Natural Gas Liquids | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 4 3 9 8  
Other | Natural Gas Pipelines | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) 0 $ 0 1 $ 1  
Other | Refined Products and Crude | Operating segments          
Segment Reporting Information [Line Items]          
Total revenues (Note L) $ 72   $ 72