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Debt Debt Outstanding (Details) - USD ($)
shares in Millions
1 Months Ended 6 Months Ended
Feb. 24, 2020
Jan. 09, 2020
Apr. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]            
Current portion of debt       $ 3,006,000,000   $ 2,477,000,000
Total long-term debt       29,976,000,000   30,883,000,000
Total debt(e)       32,982,000,000   33,360,000,000
Debt fair value adjustments       1,465,000,000   1,032,000,000
Proceeds from issuances of debt       2,652,000,000 $ 3,042,000,000  
Proceeds from Sale and Maturity of Marketable Securities   $ 907,000,000        
Proceeds From Sale And Maturity Of Marketable Securities After Taxes   $ 764,000,000        
Marketable securities at fair value       0   925,000,000
Repayments of debt       3,037,000,000 $ 4,622,000,000  
Commercial paper notes(a)            
Debt Instrument [Line Items]            
Current portion of debt       0   $ 37,000,000
Debt, Weighted Average Interest Rate           1.90%
Current portion of other debt            
Debt Instrument [Line Items]            
Current portion of debt       46,000,000   $ 45,000,000
6.85%, due February 2020            
Debt Instrument [Line Items]            
Current portion of debt       0   $ 700,000,000
Debt Instrument, Interest Rate, Stated Percentage           6.85%
6.50%, due April 2020            
Debt Instrument [Line Items]            
Current portion of debt       0   $ 535,000,000
Debt Instrument, Interest Rate, Stated Percentage           6.50%
5.30%, due September 2020            
Debt Instrument [Line Items]            
Current portion of debt       $ 600,000,000   $ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage       5.30%   5.30%
6.50%, due September 2020            
Debt Instrument [Line Items]            
Current portion of debt       $ 349,000,000   $ 349,000,000
Debt Instrument, Interest Rate, Stated Percentage       6.50%   6.50%
5.00%, due February 2021            
Debt Instrument [Line Items]            
Current portion of debt       $ 750,000,000   $ 0
Debt Instrument, Interest Rate, Stated Percentage       5.00%   5.00%
3.50%, due March 2021            
Debt Instrument [Line Items]            
Current portion of debt       $ 750,000,000   $ 0
Debt Instrument, Interest Rate, Stated Percentage       3.50%   3.50%
5.80%, Due March 2021 Notes            
Debt Instrument [Line Items]            
Current portion of debt       $ 400,000,000   $ 0
Debt Instrument, Interest Rate, Stated Percentage       5.80%   5.80%
Other            
Debt Instrument [Line Items]            
Total long-term debt       $ 226,000,000   $ 228,000,000
$4 billion credit facility due November 16, 2023            
Debt Instrument [Line Items]            
Current portion of debt       0   0
Line of Credit Facility, Current Borrowing Capacity       4,000,000,000.0    
Senior notes            
Debt Instrument [Line Items]            
Total long-term debt       29,267,000,000   30,164,000,000
Senior notes | 6.50%, due April 2020            
Debt Instrument [Line Items]            
Repayments of debt     $ 535,000,000      
Capital Trust I | Trust I preferred securities, 4.75%, due March 2028            
Debt Instrument [Line Items]            
Current portion of debt       111,000,000   111,000,000
Total long-term debt       $ 110,000,000   $ 110,000,000
Debt Instrument, Interest Rate, Stated Percentage       4.75%   4.75%
Kinder Morgan G.P., Inc. | KMI $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock            
Debt Instrument [Line Items]            
Current portion of debt       $ 0   $ 100,000,000
Preferred Stock, Liquidation Preference, Value           1,000
EPC Building LLC | EPC Building, LLC, promissory note, 3.967%, due 2020 through 2035            
Debt Instrument [Line Items]            
Total long-term debt       $ 373,000,000   $ 381,000,000
Debt Instrument, Interest Rate, Stated Percentage       3.967%   3.967%
TGP | Senior notes            
Debt Instrument [Line Items]            
Total long-term debt $ 1,000,000,000          
Debt Instrument, Interest Rate, Stated Percentage 2.90%          
Proceeds from issuances of debt $ 991,000,000          
Kinder Morgan Canada Limited            
Debt Instrument [Line Items]            
Disposal Group, Including Discontinued Operation, Aggregate Shares   25