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Acquisitions and Divestitures Sale of Interest in Canadian Business (Details)
CAD / shares in Units, CAD in Millions, $ in Millions
12 Months Ended
May 30, 2017
USD ($)
May 30, 2017
CAD
CAD / shares
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from noncontrolling interests     $ 12 $ 117 $ 11
Noncontrolling Interest, Increase from Sale of Parent Equity Interest     1,049    
Total current assets     2,715 3,229  
Property, plant and equipment, net     40,155 38,705  
Other non-current assets     1,582 1,522  
Total Assets     79,055 80,305  
Current portion of debt     2,828 2,696  
Total other current liabilities     6,181 5,924  
Long-term debt     35,015 37,354  
Other long-term liabilities and deferred credits     2,735 2,225  
Total Liabilities     $ 43,931 $ 45,503  
Other funded debt percentage     60.00%    
Kinder Morgan Canada Limited [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   30.00%      
Kinder Morgan Canada Limited Partnership [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total current assets     $ 270    
Property, plant and equipment, net     2,956    
Other non-current assets     322    
Total Assets     3,548    
Current portion of debt     0    
Total other current liabilities     236    
Long-term debt     0    
Other long-term liabilities and deferred credits     414    
Total Liabilities     650    
Non-controlling interests          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling Interest, Increase from Sale of Parent Equity Interest     684    
Kinder Morgan Canada Limited [Member] | KML Special Voting Shares [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Controlling Interest, Ownership Percentage by Parent   100.00%      
Kinder Morgan Canada Limited [Member] | KML Voting Shares [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Controlling Interest, Ownership Percentage by Parent   70.00%      
Sale of Equity Interest in Canadian Business [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from noncontrolling interests     1,245    
Adjustments to Additional Paid in Capital, Other     314    
Deferred Income Tax Adjustment due to IPO     166    
Sale of Equity Interest in Canadian Business [Member] | Restricted Voting Shares [Member] | Kinder Morgan Canada Limited [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Shares, Issued | shares   102,942,000      
Shares Issued, Price Per Share | CAD / shares   CAD 17.00      
Proceeds from Issuance Initial Public Offering $ 1,299 CAD 1,750      
Sale of Equity Interest in Canadian Business [Member] | Non-controlling interests | Kinder Morgan Canada Limited [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling Interest, Increase from Sale of Parent Equity Interest     765    
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)     $ (81)    
Sale of Equity Interest in Canadian Business [Member] | Kinder Morgan Canada Limited Partnership [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   30.00%      
Controlling Interest Percentage Retained After Partial Sale   70.00%