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Debt - Additional Information (Details) $ / shares in Units, $ in Millions				12 Months Ended
	Jan. 04, 2021 USD ($)	Aug. 05, 2020 USD ($)	Feb. 24, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares $ / € shares	Dec. 31, 2019 USD ($) $ / shares $ / € shares	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount				$ 33,396	$ 33,360
Repayments of debt				3,996	11,224	$ 14,591
Issuances of debt				$ 3,888	$ 8,036	$ 14,751
Exchange rate | $ / €				1.2216	1.1213
Debt fair value adjustments				$ 1,293	$ 1,032
Capital Trust I
Debt Instrument [Line Items]
Ownership percentage				100.00%
Senior Notes
Debt Instrument [Line Items]
Redemption Price				100.00%
Issuances of debt		$ 1,226
3.50%, due March 2021(c) | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage				3.50%
Aggregate principal amount				$ 750	750
3.50%, due March 2021(c) | Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Repayments of debt	$ 750
2.00%, due February 2031(f) | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage		2.00%		2.00%
Aggregate principal amount		$ 750		$ 750	0
1.50%, due March 2022 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage				1.50%
Aggregate principal amount				$ 917	841
Change to debt as a result of changes in exchange rate				$ 102	26
2.25%, due March 2027 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage				2.25%
Aggregate principal amount				$ 611	561
Change to debt as a result of changes in exchange rate				$ 68	18
Trust I Preferred Securities, 4.75%, due March 2028(h) | Capital Trust I
Debt Instrument [Line Items]
Interest rate, stated percentage				4.75%
Aggregate principal amount				$ 221	221
Trust Convertible Preferred Securities Outstanding | shares				4,400,000
Liquidation preference | $ / shares				$ 50
Conversion price | $ / shares				$ 25.18
Trust I Preferred Securities, 4.75%, due March 2028(h) | Capital Trust I | Class P
Debt Instrument [Line Items]
Conversion rate				0.7197
KMGP, $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock, due August 2057(i) | Kinder Morgan G.P., Inc.
Debt Instrument [Line Items]
Aggregate principal amount				$ 0	$ 100
Liquidation preference | $ / shares					$ 1,000
Preferred stock, shares outstanding | shares					100,000
3.25%, due August 2050 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage		3.25%		3.25%
Aggregate principal amount		$ 500		$ 500	$ 0
2.90%, due March 2030 | Senior Notes | TGP
Debt Instrument [Line Items]
Interest rate, stated percentage			2.90%	2.90%
Aggregate principal amount			$ 1,000	$ 1,000	$ 0
Issuances of debt			$ 991

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Fair value adjustments to debt as of the balance sheet date including fair value purchase accounting adjustments to debt and fair value of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet as well as unamortized portions of proceeds received from early termination of interest rate swap agreements.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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