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Business Segments and Related Information - Schedule of Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment revenues:      
Revenues $ 52,596 $ 56,219 $ 49,715
Significant segment expenses:      
Cost of sales 38,566 42,580 37,023
Other segment income:      
Equity in income of unconsolidated affiliates 361 408 462
NGL Pipelines & Services      
Segment revenues:      
Revenues 17,316 20,276 17,645
Other segment income:      
Equity in income of unconsolidated affiliates 83 117 133
Crude Oil Pipelines & Services      
Segment revenues:      
Revenues 20,761 21,580 19,336
Other segment income:      
Equity in income of unconsolidated affiliates 271 285 320
Natural Gas Pipelines & Services      
Segment revenues:      
Revenues 4,167 3,004 3,776
Other segment income:      
Equity in income of unconsolidated affiliates 5 5 6
Petrochemical & Refined Products Services      
Segment revenues:      
Revenues 10,352 11,359 8,958
Other segment income:      
Equity in income of unconsolidated affiliates 2 1 3
Nonrelated Party      
Segment revenues:      
Revenues 52,544 56,161 49,654
Related Party      
Segment revenues:      
Revenues 52 58 61
Operating Segments      
Segment revenues:      
Revenues 184,136 185,475 171,736
Significant segment expenses:      
Cost of sales 168,969 170,769 157,973
Variable operating costs and expenses 1,514 1,323 1,388
Fixed operating costs and expenses 4,045 3,820 3,464
Total operating costs and expenses 174,528 175,912 162,825
Other segment income:      
Equity in income of unconsolidated affiliates 361 408 462
Other segment items 85 47 3
Total other segment income (expense), net 446 455 465
Total segment gross operating margin 10,054 10,018 9,376
Other financial information:      
Capital expenditures 5,620 4,544 3,266
Operating Segments | NGL Pipelines & Services      
Segment revenues:      
Revenues 84,375 69,098 63,135
Significant segment expenses:      
Cost of sales 76,347 61,260 56,143
Variable operating costs and expenses 844 745 741
Fixed operating costs and expenses 1,750 1,682 1,589
Total operating costs and expenses 78,941 63,687 58,473
Other segment income:      
Equity in income of unconsolidated affiliates 83 117 133
Other segment items 42 20 103
Total other segment income (expense), net 125 137 236
Total segment gross operating margin 5,559 5,548 4,898
Other financial information:      
Capital expenditures 3,326 2,498 1,366
Operating Segments | Crude Oil Pipelines & Services      
Segment revenues:      
Revenues 63,136 75,995 76,458
Significant segment expenses:      
Cost of sales 61,380 74,098 74,437
Variable operating costs and expenses 140 132 191
Fixed operating costs and expenses 408 414 403
Total operating costs and expenses 61,928 74,644 75,031
Other segment income:      
Equity in income of unconsolidated affiliates 271 285 320
Other segment items 22 10 (40)
Total other segment income (expense), net 293 295 280
Total segment gross operating margin 1,501 1,646 1,707
Other financial information:      
Capital expenditures 112 161 119
Operating Segments | Natural Gas Pipelines & Services      
Segment revenues:      
Revenues 5,127 3,671 4,303
Significant segment expenses:      
Cost of sales 2,746 1,656 2,583
Variable operating costs and expenses 77 73 59
Fixed operating costs and expenses 758 676 595
Total operating costs and expenses 3,581 2,405 3,237
Other segment income:      
Equity in income of unconsolidated affiliates 5 5 6
Other segment items 7 6 5
Total other segment income (expense), net 12 11 11
Total segment gross operating margin 1,558 1,277 1,077
Other financial information:      
Capital expenditures 1,628 932 793
Operating Segments | Petrochemical & Refined Products Services      
Segment revenues:      
Revenues 31,498 36,711 27,840
Significant segment expenses:      
Cost of sales 28,496 33,755 24,810
Variable operating costs and expenses 453 373 397
Fixed operating costs and expenses 1,129 1,048 877
Total operating costs and expenses 30,078 35,176 26,084
Other segment income:      
Equity in income of unconsolidated affiliates 2 1 3
Other segment items 14 11 (65)
Total other segment income (expense), net 16 12 (62)
Total segment gross operating margin 1,436 1,547 1,694
Other financial information:      
Capital expenditures 554 953 988
Operating Segments | Nonrelated Party      
Segment revenues:      
Revenues 52,544 56,161 49,654
Operating Segments | Nonrelated Party | NGL Pipelines & Services      
Segment revenues:      
Revenues 17,308 20,264 17,635
Operating Segments | Nonrelated Party | Crude Oil Pipelines & Services      
Segment revenues:      
Revenues 20,735 21,546 19,300
Operating Segments | Nonrelated Party | Natural Gas Pipelines & Services      
Segment revenues:      
Revenues 4,149 2,992 3,761
Operating Segments | Nonrelated Party | Petrochemical & Refined Products Services      
Segment revenues:      
Revenues 10,352 11,359 8,958
Operating Segments | Related Party      
Segment revenues:      
Revenues 52 58 61
Operating Segments | Related Party | NGL Pipelines & Services      
Segment revenues:      
Revenues 8 12 10
Operating Segments | Related Party | Crude Oil Pipelines & Services      
Segment revenues:      
Revenues 26 34 36
Operating Segments | Related Party | Natural Gas Pipelines & Services      
Segment revenues:      
Revenues 18 12 15
Operating Segments | Related Party | Petrochemical & Refined Products Services      
Segment revenues:      
Revenues 0 0 0
Eliminations      
Segment revenues:      
Revenues (131,540) (129,256) (122,021)
Eliminations | NGL Pipelines & Services      
Segment revenues:      
Revenues (67,059) (48,822) (45,490)
Eliminations | Crude Oil Pipelines & Services      
Segment revenues:      
Revenues (42,375) (54,415) (57,122)
Eliminations | Natural Gas Pipelines & Services      
Segment revenues:      
Revenues (960) (667) (527)
Eliminations | Petrochemical & Refined Products Services      
Segment revenues:      
Revenues $ (21,146) $ (25,352) $ (18,882)