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Debt (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 36,593 $ 36,916
Less: Current portion of debt 3,388 2,828
Long Term Debt Non-current Excluding Debt Fair Value Adjustments $ 33,205 $ 34,088
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000
Preferred stock, shares outstanding (in shares) 0 1,600,000
Preferred Stock, Dividend Rate, Percentage 9.75% 9.75%
Debt fair value adjustments $ 731 $ 927
Capital Trust [Member]    
Debt Instrument [Line Items]    
Controlling Interest, Ownership Percentage by Parent 100.00%  
Credit facility and commercial paper borrowings    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 433 365
6.00%, due January 2018    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount 0 750
Less: Current portion of debt $ 0 $ 750
Interest rate, stated percentage 6.00% 6.00%
7.00%, due February 2018    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 0 $ 82
Less: Current portion of debt $ 0 $ 82
Interest rate, stated percentage 7.00% 7.00%
5.95%, due February 2018    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 0 $ 975
Less: Current portion of debt $ 0 $ 975
Interest rate, stated percentage 5.95% 5.95%
7.25%, due June 2018    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 0 $ 477
Less: Current portion of debt $ 0 $ 477
Interest rate, stated percentage 7.25% 7.25%
9.00%, due February 2019    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 500 $ 500
Less: Current portion of debt $ 500 $ 0
Interest rate, stated percentage 9.00% 9.00%
2.65%, due February 2019    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 800 $ 800
Less: Current portion of debt $ 800 $ 0
Interest rate, stated percentage 2.65% 2.65%
3.05%, due December 2019    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1,500 $ 1,500
Less: Current portion of debt $ 1,500 $ 0
Interest rate, stated percentage 3.05% 3.05%
6.85%, due February 2020    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 700 $ 700
Interest rate, stated percentage 6.85% 6.85%
6.50%, due April 2020    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 535 $ 535
Interest rate, stated percentage 6.50% 6.50%
5.30%, due September 2020    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 600 $ 600
Interest rate, stated percentage 5.30% 5.30%
6.50%, due September 2020    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 349 $ 349
Interest rate, stated percentage 6.50% 6.50%
5.00%, due February 2021    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 750 $ 750
Interest rate, stated percentage 5.00% 5.00%
3.50%, due March 2021    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 750 $ 750
Interest rate, stated percentage 3.50% 3.50%
5.80%, due March 2021    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 400 $ 400
Interest rate, stated percentage 5.80% 5.80%
5.00%, due October 2021    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 500 $ 500
Interest rate, stated percentage 5.00% 5.00%
4.15%, due March 2022    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 375 $ 375
Interest rate, stated percentage 4.15% 4.15%
1.50%, due March 2022    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 860 $ 900
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax $ 46 $ 86
Interest rate, stated percentage 1.50% 1.50%
3.95%, due September 2022    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1,000 $ 1,000
Interest rate, stated percentage 3.95% 3.95%
3.15%, due January 2023    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1,000 $ 1,000
Interest rate, stated percentage 3.15% 3.15%
Floating rate, due January 2023    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 250 $ 250
3.45%, due February 2023    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 625 $ 625
Interest rate, stated percentage 3.45% 3.45%
3.50%, due September 2023    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 600 $ 600
Interest rate, stated percentage 3.50% 3.50%
5.625%, due November 2023    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 750 $ 750
Interest rate, stated percentage 5.63% 5.63%
4.15%, due February 2024    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 650 $ 650
Interest rate, stated percentage 4.15% 4.15%
4.30%, due May 2024    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 600 $ 600
Interest rate, stated percentage 4.30% 4.30%
4.25%, due September 2024    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 650 $ 650
Interest rate, stated percentage 4.25% 4.25%
4.30%, due June 2025    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1,500 $ 1,500
Interest rate, stated percentage 4.30% 4.30%
6.70%, due February 2027    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 7 $ 7
Interest rate, stated percentage 6.70% 6.70%
2.25%, due March 2027    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 573 $ 600
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax $ 30 $ 57
Interest rate, stated percentage 2.25% 2.25%
6.67%, due November 2027    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 7 $ 7
Interest rate, stated percentage 6.67% 6.67%
4.30%, due March 2028    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1,250 $ 0
Interest rate, stated percentage 4.30% 4.30%
7.25%, due March 2028    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 32 $ 32
Interest rate, stated percentage 7.25% 7.25%
6.95%, due June 2028    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 31 $ 31
Interest rate, stated percentage 6.95% 6.95%
8.05%, due October 2030    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 234 $ 234
Interest rate, stated percentage 8.05% 8.05%
7.40%, due March 2031    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 300 $ 300
Interest rate, stated percentage 7.40% 7.40%
7.80%, due August 2031    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 537 $ 537
Interest rate, stated percentage 7.80% 7.80%
7.75%, due January 2032    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1,005 $ 1,005
Interest rate, stated percentage 7.75% 7.75%
7.75%, due March 2032    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 300 $ 300
Interest rate, stated percentage 7.75% 7.75%
7.30%, due August 2033    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 500 $ 500
Interest rate, stated percentage 7.30% 7.30%
5.30%, due December 2034    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 750 $ 750
Interest rate, stated percentage 5.30% 5.30%
5.80%, due March 2035    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 500 $ 500
Interest rate, stated percentage 5.80% 5.80%
7.75%, due October 2035    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1 $ 1
Interest rate, stated percentage 7.75% 7.75%
6.40%, due January 2036    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 36 $ 36
Interest rate, stated percentage 6.40% 6.40%
6.50%, due February 2037    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 400 $ 400
Interest rate, stated percentage 6.50% 6.50%
7.42%, due February 2037    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 47 $ 47
Interest rate, stated percentage 7.42% 7.42%
6.95%, due January 2038    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1,175 $ 1,175
Interest rate, stated percentage 6.95% 6.95%
6.50%, due September 2039    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 600 $ 600
Interest rate, stated percentage 6.50% 6.50%
6.55%, due September 2040    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 400 $ 400
Interest rate, stated percentage 6.55% 6.55%
7.50%, due November 2040    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 375 $ 375
Interest rate, stated percentage 7.50% 7.50%
6.375%, due March 2041    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 600 $ 600
Interest rate, stated percentage 6.38% 6.38%
5.625%, due September 2041    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 375 $ 375
Interest rate, stated percentage 5.63% 5.63%
5.00%, due August 2042    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 625 $ 625
Interest rate, stated percentage 5.00% 5.00%
4.70%, due November 2042    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 475 $ 475
Interest rate, stated percentage 4.70% 4.70%
5.00%, due March 2043    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 700 $ 700
Interest rate, stated percentage 5.00% 5.00%
5.50%, due March 2044    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 750 $ 750
Interest rate, stated percentage 5.50% 5.50%
5.40%, due September 2044    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 550 $ 550
Interest rate, stated percentage 5.40% 5.40%
5.55%, due June 2045    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 1,750 $ 1,750
Interest rate, stated percentage 5.55% 5.55%
5.05%, due February 2046    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 800 $ 800
Interest rate, stated percentage 5.05% 5.05%
5.20%, due March 2048    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 750 $ 0
Interest rate, stated percentage 5.20% 5.20%
7.45%, due March 2098    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 26 $ 26
Interest rate, stated percentage 7.45% 7.45%
7.00%, due March 2027 | TGP    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 300 $ 300
Interest rate, stated percentage 7.00% 7.00%
7.00%, due October 2028 | TGP    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 400 $ 400
Interest rate, stated percentage 7.00% 7.00%
8.375%, due June 2032 | TGP    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 240 $ 240
Interest rate, stated percentage 8.38% 8.38%
7.625%, due April 2037 | TGP    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 300 $ 300
Interest rate, stated percentage 7.63% 7.63%
8.625%, due January 2022 | EPNG [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 260 $ 260
Interest rate, stated percentage 8.63% 8.63%
7.50%, due November 2026 | EPNG [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 200 $ 200
Interest rate, stated percentage 7.50% 7.50%
8.375%, due June 2032 | EPNG [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 300 $ 300
Interest rate, stated percentage 8.38% 8.38%
4.15%, due August 2026 | CIG [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 375 $ 375
Interest rate, stated percentage 4.15% 4.15%
6.85%, due June 2037 | CIG [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 100 $ 100
Interest rate, stated percentage 6.85% 6.85%
EPC Building, LLC, promissory note, 3.967%, due December 2035 | EPC Building LLC [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 409 $ 421
Interest rate, stated percentage 3.97% 3.97%
Trust I Preferred Securities, 4.75%, due March 2028    
Debt Instrument [Line Items]    
Debt Instrument, Convertible, Conversion Price $ 25.18  
Trust I Preferred Securities, 4.75%, due March 2028 | Class P    
Debt Instrument [Line Items]    
Preferred Stock, Conversion, Shares 0.7197  
Trust I Preferred Securities, 4.75%, due March 2028 | Capital Trust I [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 221 $ 221
Interest rate, stated percentage 4.75% 4.75%
Trust Convertible Preferred Securities Outstanding (in shares) 4,400,000  
Preferred Stock, Liquidation Preference Per Share $ 50  
KMGP, $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock, due August 2057 | Kinder Morgan G.P., Inc. [Member]    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 100 $ 100
Preferred stock, shares outstanding (in shares) 100,000 100,000
Preferred stock, par value (in dollars per share) $ 1,000 $ 1,000
Preferred Stock, Dividend Rate, Percentage 3.8975%  
Other miscellaneous debt    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 250 $ 278
Senior Notes [Member]    
Debt Instrument [Line Items]    
Redemption price of debt as a percentage of face amount 100.00%  
1.50%, due March 2022 and 2.25%, due March 2027 [Member] | Euro Member Countries, Euro    
Debt Instrument [Line Items]    
Foreign Currency Exchange Rate, Translation 1.1467 1.2005