v3.26.1
Revenue Recognition - Disaggregation of Revenue (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Disaggregation of Revenue [Line Items]        
Revenues from customers $ 4,098 $ 3,606 $ 8,549 $ 7,468
Leasing services 366 376 730 734
Derivatives adjustments on commodity sales (26) 23 (53) 10
Other 39 37 79 71
Total other revenues 379 436 756 815
Total revenues 4,477 4,042 $ 9,305 8,283
Number of Reportable Segments     4  
Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenues 2,664 2,531 $ 5,955 5,281
Products Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenues 902 691 1,589 1,354
Terminals        
Disaggregation of Revenue [Line Items]        
Total revenues 556 531 1,118 1,047
CO2        
Disaggregation of Revenue [Line Items]        
Total revenues 355 289 643 601
Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 2,508 2,387 5,653 5,010
Leasing services 112 113 222 225
Derivatives adjustments on commodity sales 24 9 36 6
Other 27 27 56 49
Total other revenues 163 149 314 280
Total revenues 2,671 2,536 5,967 5,290
Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 852 630 1,489 1,241
Leasing services 43 55 87 100
Derivatives adjustments on commodity sales 0 0 (1) 0
Other 7 6 14 13
Total other revenues 50 61 100 113
Total revenues 902 691 1,589 1,354
Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 360 343 732 677
Leasing services 198 190 391 374
Derivatives adjustments on commodity sales 0 0 0 0
Other 0 0 0 0
Total other revenues 198 190 391 374
Total revenues 558 533 1,123 1,051
Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 387 254 692 554
Leasing services 13 18 30 35
Derivatives adjustments on commodity sales (50) 14 (88) 4
Other 5 4 9 9
Total other revenues (32) 36 (49) 48
Total revenues 355 290 643 602
Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (9) (8) (17) (14)
Leasing services 0 0 0 0
Derivatives adjustments on commodity sales 0 0 0 0
Other 0 0 0 0
Total other revenues 0 0 0 0
Total revenues (9) (8) (17) (14)
Corporate and Eliminations | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenues (7) (5) (12) (9)
Corporate and Eliminations | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 0 0
Corporate and Eliminations | Terminals        
Disaggregation of Revenue [Line Items]        
Total revenues (2) (2) (5) (4)
Corporate and Eliminations | CO2        
Disaggregation of Revenue [Line Items]        
Total revenues 0 (1) 0 (1)
Firm services        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,365 1,293 2,825 2,635
Firm services | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,078 1,018 2,225 2,091
Firm services | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 63 47 124 100
Firm services | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 224 228 477 445
Firm services | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1 1 1 1
Firm services | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (1) (1) (2) (2)
Fee-based services        
Disaggregation of Revenue [Line Items]        
Revenues from customers 732 666 1,439 1,334
Fee-based services | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 343 281 673 582
Fee-based services | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 272 278 536 535
Fee-based services | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 108 99 209 200
Fee-based services | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 11 10 25 20
Fee-based services | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (2) (2) (4) (3)
Total services        
Disaggregation of Revenue [Line Items]        
Revenues from customers 2,097 1,959 4,264 3,969
Total services | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,421 1,299 2,898 2,673
Total services | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 335 325 660 635
Total services | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 332 327 686 645
Total services | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 12 11 26 21
Total services | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (3) (3) (6) (5)
Natural gas sales        
Disaggregation of Revenue [Line Items]        
Revenues from customers 806 879 2,260 1,873
Natural gas sales | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 799 870 2,236 1,850
Natural gas sales | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 0 0 0 0
Natural gas sales | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 0 0 0 0
Natural gas sales | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 8 11 27 27
Natural gas sales | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (1) (2) (3) (4)
Product sales        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,162 740 1,948 1,560
Product sales | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 287 211 502 473
Product sales | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 517 305 829 606
Product sales | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 28 16 46 32
Product sales | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 336 210 579 453
Product sales | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (6) (2) (8) (4)
Other sales        
Disaggregation of Revenue [Line Items]        
Revenues from customers 33 28 77 66
Other sales | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1 7 17 14
Other sales | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 0 0 0 0
Other sales | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 0 0 0 0
Other sales | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 31 22 60 53
Other sales | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1 (1) 0 (1)
Total commodity sales        
Disaggregation of Revenue [Line Items]        
Revenues from customers 2,001 1,647 4,285 3,499
Total revenues 1,978 1,668 4,223 3,504
Total commodity sales | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,087 1,088 2,755 2,337
Total commodity sales | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 517 305 829 606
Total commodity sales | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 28 16 46 32
Total commodity sales | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 375 243 666 533
Total commodity sales | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers $ (6) $ (5) $ (11) $ (9)