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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Revenues from customers $ 3,445 $ 4,089
Leasing services 330 314
Derivatives adjustments on commodity sales 86 (141)
Other 27 31
Total other revenues 443 204
Total revenues 3,888 4,293
Natural Gas Pipelines    
Disaggregation of Revenue [Line Items]    
Total revenues 2,463 2,793
Products Pipelines    
Disaggregation of Revenue [Line Items]    
Total revenues 668 766
Terminals    
Disaggregation of Revenue [Line Items]    
Total revenues 460 429
CO2    
Disaggregation of Revenue [Line Items]    
Total revenues 297 305
Operating Segments | Natural Gas Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 2,226 2,720
Leasing services 117 117
Derivatives adjustments on commodity sales 107 (39)
Other 16 15
Total other revenues 240 93
Total revenues 2,466 2,813
Operating Segments | Products Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 616 719
Leasing services 47 44
Derivatives adjustments on commodity sales (1) (3)
Other 6 6
Total other revenues 52 47
Total revenues 668 766
Operating Segments | Terminals    
Disaggregation of Revenue [Line Items]    
Revenues from customers 309 290
Leasing services 152 140
Derivatives adjustments on commodity sales 0 0
Other 0 0
Total other revenues 152 140
Total revenues 461 430
Operating Segments | CO2    
Disaggregation of Revenue [Line Items]    
Revenues from customers 298 381
Leasing services 14 13
Derivatives adjustments on commodity sales (20) (99)
Other 5 10
Total other revenues (1) (76)
Total revenues 297 305
Corporate and intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from customers (4) (21)
Leasing services 0 0
Derivatives adjustments on commodity sales 0 0
Other 0 0
Total other revenues 0 0
Total revenues (4) (21)
Firm services    
Disaggregation of Revenue [Line Items]    
Revenues from customers 1,163 1,185
Firm services | Operating Segments | Natural Gas Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 917 939
Firm services | Operating Segments | Products Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 40 59
Firm services | Operating Segments | Terminals    
Disaggregation of Revenue [Line Items]    
Revenues from customers 207 188
Firm services | Operating Segments | CO2    
Disaggregation of Revenue [Line Items]    
Revenues from customers 0 0
Firm services | Corporate and intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from customers (1) (1)
Fee-based services    
Disaggregation of Revenue [Line Items]    
Revenues from customers 584 558
Fee-based services | Operating Segments | Natural Gas Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 236 213
Fee-based services | Operating Segments | Products Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 240 234
Fee-based services | Operating Segments | Terminals    
Disaggregation of Revenue [Line Items]    
Revenues from customers 98 98
Fee-based services | Operating Segments | CO2    
Disaggregation of Revenue [Line Items]    
Revenues from customers 10 13
Fee-based services | Corporate and intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from customers 0 0
Total services    
Disaggregation of Revenue [Line Items]    
Revenues from customers 1,747 1,743
Total services | Operating Segments | Natural Gas Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 1,153 1,152
Total services | Operating Segments | Products Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 280 293
Total services | Operating Segments | Terminals    
Disaggregation of Revenue [Line Items]    
Revenues from customers 305 286
Total services | Operating Segments | CO2    
Disaggregation of Revenue [Line Items]    
Revenues from customers 10 13
Total services | Corporate and intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from customers (1) (1)
Natural gas sales    
Disaggregation of Revenue [Line Items]    
Revenues from customers 817 1,242
Natural gas sales | Operating Segments | Natural Gas Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 799 1,226
Natural gas sales | Operating Segments | Products Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 0 0
Natural gas sales | Operating Segments | Terminals    
Disaggregation of Revenue [Line Items]    
Revenues from customers 0 0
Natural gas sales | Operating Segments | CO2    
Disaggregation of Revenue [Line Items]    
Revenues from customers 20 20
Natural gas sales | Corporate and intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from customers (2) (4)
Product sales    
Disaggregation of Revenue [Line Items]    
Revenues from customers 881 1,104
Product sales | Operating Segments | Natural Gas Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 274 342
Product sales | Operating Segments | Products Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 336 426
Product sales | Operating Segments | Terminals    
Disaggregation of Revenue [Line Items]    
Revenues from customers 4 4
Product sales | Operating Segments | CO2    
Disaggregation of Revenue [Line Items]    
Revenues from customers 268 348
Product sales | Corporate and intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from customers (1) (16)
Total commodity sales    
Disaggregation of Revenue [Line Items]    
Revenues from customers 1,698 2,346
Total revenues 1,785 2,208
Total commodity sales | Operating Segments | Natural Gas Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 1,073 1,568
Total commodity sales | Operating Segments | Products Pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from customers 336 426
Total commodity sales | Operating Segments | Terminals    
Disaggregation of Revenue [Line Items]    
Revenues from customers 4 4
Total commodity sales | Operating Segments | CO2    
Disaggregation of Revenue [Line Items]    
Revenues from customers 288 368
Total commodity sales | Corporate and intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from customers $ (3) $ (20)