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Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers $ 10,097 $ 12,080 $ 13,318
Leasing services 1,236 951 868
Other 146 129 91
Total other revenues 1,603 1,129 826
Total revenues 11,700 13,209 14,144
Firm services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 4,370 4,877 4,746
Fee-based services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,056 2,416 2,466
Total services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 6,426 7,293 7,212
Natural gas sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,032 2,595 3,318
Product sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,639 2,192 2,788
Total commodity sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 3,671 4,787 6,106
Total revenues 3,891 4,811 5,987
Natural Gas Pipelines      
Disaggregation of Revenue [Line Items]      
Total revenues 7,222 8,128 8,807
Products Pipelines      
Disaggregation of Revenue [Line Items]      
Total revenues 1,721 1,831 1,887
Terminals      
Disaggregation of Revenue [Line Items]      
Total revenues 1,719 2,031 2,025
CO2      
Disaggregation of Revenue [Line Items]      
Total revenues 1,038 1,219 1,255
Kinder Morgan Canada      
Disaggregation of Revenue [Line Items]      
Total revenues 0 0 170
Operating Segments | Natural Gas Pipelines      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 6,659 7,737 8,596
Leasing services 466 273 220
Other 116 90 64
Total other revenues 600 433 259
Total revenues 7,259 8,170 8,855
Operating Segments | Natural Gas Pipelines | Firm services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 3,345 3,549 3,387
Operating Segments | Natural Gas Pipelines | Fee-based services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 714 780 692
Operating Segments | Natural Gas Pipelines | Total services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 4,059 4,329 4,079
Operating Segments | Natural Gas Pipelines | Natural gas sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,038 2,603 3,327
Operating Segments | Natural Gas Pipelines | Product sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 562 805 1,190
Operating Segments | Natural Gas Pipelines | Total commodity sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,600 3,408 4,517
Operating Segments | Products Pipelines      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,534 1,624 1,725
Leasing services 166 182 158
Other 21 25 4
Total other revenues 187 207 162
Total revenues 1,721 1,831 1,887
Operating Segments | Products Pipelines | Firm services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 271 319 376
Operating Segments | Products Pipelines | Fee-based services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 905 1,016 956
Operating Segments | Products Pipelines | Total services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,176 1,335 1,332
Operating Segments | Products Pipelines | Natural gas sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segments | Products Pipelines | Product sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 358 289 393
Operating Segments | Products Pipelines | Total commodity sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 358 289 393
Operating Segments | Terminals      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,165 1,592 1,587
Leasing services 557 442 440
Other 0 0 0
Total other revenues 557 442 440
Total revenues 1,722 2,034 2,027
Operating Segments | Terminals | Firm services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 756 1,012 983
Operating Segments | Terminals | Fee-based services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 395 560 584
Operating Segments | Terminals | Total services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,151 1,572 1,567
Operating Segments | Terminals | Natural gas sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0 0
Operating Segments | Terminals | Product sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 14 20 20
Operating Segments | Terminals | Total commodity sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 14 20 20
Operating Segments | CO2      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 779 1,173 1,293
Leasing services 47 54 48
Other 9 13 22
Total other revenues 259 46 (38)
Total revenues 1,038 1,219 1,255
Operating Segments | CO2 | Firm services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1 1 2
Operating Segments | CO2 | Fee-based services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 42 60 67
Operating Segments | CO2 | Total services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 43 61 69
Operating Segments | CO2 | Natural gas sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1 1 2
Operating Segments | CO2 | Product sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 735 1,111 1,222
Operating Segments | CO2 | Total commodity sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 736 1,112 1,224
Operating Segments | Kinder Morgan Canada      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers     167
Leasing services     2
Other     1
Total other revenues     3
Total revenues     170
Operating Segments | Kinder Morgan Canada | Firm services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers     0
Operating Segments | Kinder Morgan Canada | Fee-based services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers     167
Operating Segments | Kinder Morgan Canada | Total services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers     167
Operating Segments | Kinder Morgan Canada | Natural gas sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers     0
Operating Segments | Kinder Morgan Canada | Product sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers     0
Operating Segments | Kinder Morgan Canada | Total commodity sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers     0
Corporate and Eliminations      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers (40) (46) (50)
Leasing services 0 0 0
Other 0 1 0
Total other revenues 0 1 0
Total revenues (40) (45) (50)
Corporate and Eliminations | Firm services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers (3) (4) (2)
Corporate and Eliminations | Fee-based services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 0 0 0
Corporate and Eliminations | Total services      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers (3) (4) (2)
Corporate and Eliminations | Natural gas sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers (7) (9) (11)
Corporate and Eliminations | Product sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers (30) (33) (37)
Corporate and Eliminations | Total commodity sales      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers (37) (42) (48)
Sales      
Disaggregation of Revenue [Line Items]      
Derivatives adjustments on commodity sales 221 49 (133)
Sales | Operating Segments | Natural Gas Pipelines      
Disaggregation of Revenue [Line Items]      
Derivatives adjustments on commodity sales 18 70 (25)
Sales | Operating Segments | Products Pipelines      
Disaggregation of Revenue [Line Items]      
Derivatives adjustments on commodity sales 0 0 0
Sales | Operating Segments | Terminals      
Disaggregation of Revenue [Line Items]      
Derivatives adjustments on commodity sales 0 0 0
Sales | Operating Segments | CO2      
Disaggregation of Revenue [Line Items]      
Derivatives adjustments on commodity sales 203 (21) (108)
Sales | Operating Segments | Kinder Morgan Canada      
Disaggregation of Revenue [Line Items]      
Derivatives adjustments on commodity sales     0
Sales | Corporate and Eliminations      
Disaggregation of Revenue [Line Items]      
Derivatives adjustments on commodity sales $ 0 $ 0 $ 0