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Debt Debt Outstanding (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt fair value adjustments $ 860 $ 731
Current portion of debt 2,502 3,388
Long-term debt 32,468 33,205
Total debt 34,970 36,593
$500 million, 364-day credit facility due November 15, 2019    
Debt Instrument [Line Items]    
Current portion of debt 0 0
$4 billion credit facility due November 16, 2023    
Debt Instrument [Line Items]    
Current portion of debt $ 0 $ 0
Commercial paper notes(a)    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 2.75% 3.10%
Current portion of debt $ 109 $ 433
KML $500 million credit facility, due August 31, 2022(b)(c)    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 3.42%  
Foreign Currency Exchange Rate, Translation US$ per C$ 0.7483  
Current portion of debt $ 38 0
9.00%, due February 2019    
Debt Instrument [Line Items]    
Current portion of debt 0 500
2.65%, due February 2019    
Debt Instrument [Line Items]    
Current portion of debt 0 800
3.05%, due December 2019    
Debt Instrument [Line Items]    
Current portion of debt 1,500 1,500
6.85%, Due February 2020 Notes [Member]    
Debt Instrument [Line Items]    
Current portion of debt 700 0
Trust I preferred securities, 4.75%, due March 2028    
Debt Instrument [Line Items]    
Current portion of debt 111 111
Long-term debt 110 110
Current portion - Other debt    
Debt Instrument [Line Items]    
Current portion of debt 44 44
Senior notes    
Debt Instrument [Line Items]    
Long-term debt 31,649 32,380
EPC Building, LLC, promissory note, 3.967%, due 2017 through 2035    
Debt Instrument [Line Items]    
Long-term debt 405 409
Kinder Morgan G.P. Inc., $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock    
Debt Instrument [Line Items]    
Long-term debt 100 100
Other    
Debt Instrument [Line Items]    
Long-term debt $ 204 $ 206