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Business Segments and Related Information - Schedule of Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment revenues:        
Revenues $ 11,363 $ 13,483 $ 26,780 $ 28,243
Significant segment expenses:        
Cost of sales 7,899 10,184 19,904 21,589
Other segment income (expense):        
Equity in income of unconsolidated affiliates 92 101 186 203
NGL Pipelines & Services        
Segment revenues:        
Revenues 3,406 4,265 8,806 9,405
Other segment income (expense):        
Equity in income of unconsolidated affiliates 18 26 38 57
Crude Oil Pipelines & Services        
Segment revenues:        
Revenues 4,783 5,888 9,904 11,303
Other segment income (expense):        
Equity in income of unconsolidated affiliates 72 73 144 142
Natural Gas Pipelines & Services        
Segment revenues:        
Revenues 1,071 612 2,292 1,466
Other segment income (expense):        
Equity in income of unconsolidated affiliates 0 1 2 3
Petrochemical & Refined Products Services        
Segment revenues:        
Revenues 2,103 2,718 5,778 6,069
Other segment income (expense):        
Equity in income of unconsolidated affiliates 2 1 2 1
Nonrelated Party        
Segment revenues:        
Revenues 11,352 13,472 26,756 28,217
Related parties        
Segment revenues:        
Revenues 11 11 24 26
Operating Segments        
Segment revenues:        
Revenues 43,690 45,935 94,173 92,578
Significant segment expenses:        
Cost of sales 39,950 42,403 86,745 85,395
Variable operating costs and expenses 365 302 727 631
Fixed operating costs and expenses 1,008 923 2,003 1,851
Total significant segment expenses 41,323 43,628 89,475 87,877
Other segment income (expense):        
Equity in income of unconsolidated affiliates 92 101 186 203
Other segment items 12 19 51 30
Total other segment income (expense), net 104 120 237 233
Total segment gross operating margin 2,471 2,427 4,935 4,934
Other financial information:        
Capital expenditures 1,299 1,264 2,361 2,311
Operating Segments | NGL Pipelines & Services        
Segment revenues:        
Revenues 20,410 15,823 42,827 32,518
Significant segment expenses:        
Cost of sales 18,487 13,957 38,920 28,767
Variable operating costs and expenses 204 167 403 341
Fixed operating costs and expenses 442 404 865 829
Total significant segment expenses 19,133 14,528 40,188 29,937
Other segment income (expense):        
Equity in income of unconsolidated affiliates 18 26 38 57
Other segment items 2 4 38 27
Total other segment income (expense), net 20 30 76 84
Total segment gross operating margin 1,297 1,325 2,715 2,665
Other financial information:        
Capital expenditures 825 629 1,460 1,206
Operating Segments | Crude Oil Pipelines & Services        
Segment revenues:        
Revenues 14,107 20,930 29,850 40,172
Significant segment expenses:        
Cost of sales 13,660 20,467 28,967 39,216
Variable operating costs and expenses 34 26 69 72
Fixed operating costs and expenses 88 103 189 207
Total significant segment expenses 13,782 20,596 29,225 39,495
Other segment income (expense):        
Equity in income of unconsolidated affiliates 72 73 144 142
Other segment items 6 10 8 9
Total other segment income (expense), net 78 83 152 151
Total segment gross operating margin 403 417 777 828
Other financial information:        
Capital expenditures 25 44 48 81
Operating Segments | Natural Gas Pipelines & Services        
Segment revenues:        
Revenues 1,273 750 2,726 1,781
Significant segment expenses:        
Cost of sales 644 269 1,543 827
Variable operating costs and expenses 20 24 42 39
Fixed operating costs and expenses 195 168 372 318
Total significant segment expenses 859 461 1,957 1,184
Other segment income (expense):        
Equity in income of unconsolidated affiliates 0 1 2 3
Other segment items 3 3 3 5
Total other segment income (expense), net 3 4 5 8
Total segment gross operating margin 417 293 774 605
Other financial information:        
Capital expenditures 327 246 630 450
Operating Segments | Petrochemical & Refined Products Services        
Segment revenues:        
Revenues 7,900 8,432 18,770 18,107
Significant segment expenses:        
Cost of sales 7,159 7,710 17,315 16,585
Variable operating costs and expenses 107 85 213 179
Fixed operating costs and expenses 283 248 577 497
Total significant segment expenses 7,549 8,043 18,105 17,261
Other segment income (expense):        
Equity in income of unconsolidated affiliates 2 1 2 1
Other segment items 1 2 2 (11)
Total other segment income (expense), net 3 3 4 (10)
Total segment gross operating margin 354 392 669 836
Other financial information:        
Capital expenditures 122 345 223 574
Operating Segments | Nonrelated Party        
Segment revenues:        
Revenues 11,352 13,472 26,756 28,217
Operating Segments | Nonrelated Party | NGL Pipelines & Services        
Segment revenues:        
Revenues 3,404 4,262 8,802 9,399
Operating Segments | Nonrelated Party | Crude Oil Pipelines & Services        
Segment revenues:        
Revenues 4,777 5,883 9,892 11,289
Operating Segments | Nonrelated Party | Natural Gas Pipelines & Services        
Segment revenues:        
Revenues 1,068 609 2,284 1,460
Operating Segments | Nonrelated Party | Petrochemical & Refined Products Services        
Segment revenues:        
Revenues 2,103 2,718 5,778 6,069
Operating Segments | Related parties        
Segment revenues:        
Revenues 11 11 24 26
Operating Segments | Related parties | NGL Pipelines & Services        
Segment revenues:        
Revenues 2 3 4 6
Operating Segments | Related parties | Crude Oil Pipelines & Services        
Segment revenues:        
Revenues 6 5 12 14
Operating Segments | Related parties | Natural Gas Pipelines & Services        
Segment revenues:        
Revenues 3 3 8 6
Operating Segments | Related parties | Petrochemical & Refined Products Services        
Segment revenues:        
Revenues 0 0 0 0
Intersegment Eliminations        
Segment revenues:        
Revenues (32,327) (32,452) (67,393) (64,335)
Intersegment Eliminations | NGL Pipelines & Services        
Segment revenues:        
Revenues (17,004) (11,558) (34,021) (23,113)
Intersegment Eliminations | Crude Oil Pipelines & Services        
Segment revenues:        
Revenues (9,324) (15,042) (19,946) (28,869)
Intersegment Eliminations | Natural Gas Pipelines & Services        
Segment revenues:        
Revenues (202) (138) (434) (315)
Intersegment Eliminations | Petrochemical & Refined Products Services        
Segment revenues:        
Revenues $ (5,797) $ (5,714) $ (12,992) $ (12,038)