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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenues from customers $ 3,213 $ 3,100 $ 6,623 $ 6,545
Leasing services 348 346 690 676
Derivatives adjustments on commodity sales (25) 28 (16) 114
Other 36 27 117 54
Total other revenues 359 401 791 844
Total revenues 3,572 3,501 7,414 7,389
Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenues 1,990 1,987 4,323 4,450
Products Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenues 776 735 1,504 1,403
Terminals        
Disaggregation of Revenue [Line Items]        
Total revenues 508 477 1,002 937
CO2        
Disaggregation of Revenue [Line Items]        
Total revenues 298 302 585 599
Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,849 1,814 3,959 4,040
Leasing services 114 120 229 237
Derivatives adjustments on commodity sales 5 40 47 147
Other 25 17 94 33
Total other revenues 144 177 370 417
Total revenues 1,993 1,991 4,329 4,457
Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 717 675 1,387 1,291
Leasing services 53 52 106 99
Derivatives adjustments on commodity sales 0 2 (1) 1
Other 6 6 12 12
Total other revenues 59 60 117 112
Total revenues 776 735 1,504 1,403
Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 345 315 679 624
Leasing services 164 163 326 315
Derivatives adjustments on commodity sales 0 0 0 0
Other 0 0 0 0
Total other revenues 164 163 326 315
Total revenues 509 478 1,005 939
Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 306 301 608 599
Leasing services 17 11 29 25
Derivatives adjustments on commodity sales (30) (14) (62) (34)
Other 5 4 11 9
Total other revenues (8) 1 (22) 0
Total revenues 298 302 586 599
Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (4) (5) (10) (9)
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 (4) (5) (10) (9)
Corporate and Eliminations | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Total revenues (3) (4) (6) (7)
Corporate and Eliminations | Terminals        
Disaggregation of Revenue [Line Items]        
Total revenues (1) (1) (3) (2)
Corporate and Eliminations | CO2        
Disaggregation of Revenue [Line Items]        
Total revenues 0 0 (1) 0
Firm services        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,183 1,107 2,444 2,270
Firm services | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 920 849 1,912 1,766
Firm services | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 49 49 107 89
Firm services | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 215 208 427 415
Firm services | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 0 1 0 1
Firm services | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (1) 0 (2) (1)
Fee-based services        
Disaggregation of Revenue [Line Items]        
Revenues from customers 657 602 1,296 1,186
Fee-based services | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 257 248 528 484
Fee-based services | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 276 246 524 486
Fee-based services | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 115 98 224 196
Fee-based services | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 10 10 22 20
Fee-based services | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (1) 0 (2) 0
Total services        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,840 1,709 3,740 3,456
Total services | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,177 1,097 2,440 2,250
Total services | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 325 295 631 575
Total services | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 330 306 651 611
Total services | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 10 11 22 21
Total services | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (2) 0 (4) (1)
Natural gas sales        
Disaggregation of Revenue [Line Items]        
Revenues from customers 490 495 1,134 1,312
Natural gas sales | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 461 484 1,085 1,283
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 30 13 53 33
Natural gas sales | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (1) (2) (4) (4)
Product sales        
Disaggregation of Revenue [Line Items]        
Revenues from customers 883 896 1,749 1,777
Product sales | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 211 233 434 507
Product sales | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 392 380 756 716
Product sales | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 15 9 28 13
Product sales | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 266 277 533 545
Product sales | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers (1) (3) (2) (4)
Total commodity sales        
Disaggregation of Revenue [Line Items]        
Revenues from customers 1,373 1,391 2,883 3,089
Total revenues 1,346 1,421 2,866 3,206
Total commodity sales | Operating Segments | Natural Gas Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 672 717 1,519 1,790
Total commodity sales | Operating Segments | Products Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from customers 392 380 756 716
Total commodity sales | Operating Segments | Terminals        
Disaggregation of Revenue [Line Items]        
Revenues from customers 15 9 28 13
Total commodity sales | Operating Segments | CO2        
Disaggregation of Revenue [Line Items]        
Revenues from customers 296 290 586 578
Total commodity sales | Corporate and Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from customers $ (2) $ (5) $ (6) $ (8)