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Debt - Schedule of Current Portion of Debt (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current portion of debt	$ 2,558	$ 2,477
Debt, weighted average interest rate	4.86%	5.27%
$4 billion credit facility due November 16, 2023
Debt Instrument [Line Items]
Current portion of debt	$ 0	$ 0
Maximum borrowing capacity	4,000
Commercial Paper
Debt Instrument [Line Items]
Current portion of debt	0	$ 37
Maximum borrowing capacity	4,000
Debt, weighted average interest rate		1.90%
6.85%, due February 2020 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 700
Interest rate, stated percentage		6.85%
6.50%, due April 2020 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 535
Interest rate, stated percentage		6.50%
5.30%, due September 2020 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 600
Interest rate, stated percentage		5.30%
6.50%, due September 2020 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	0	$ 349
Interest rate, stated percentage		6.50%
5.00%, due February 2021 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	$ 750	$ 0
Interest rate, stated percentage	5.00%
3.50%, due March 2021(b) | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	$ 750	0
Interest rate, stated percentage	3.50%
5.80%, due March 2021 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	$ 400	0
Interest rate, stated percentage	5.80%
5.00%, due October 2021 | Senior Notes
Debt Instrument [Line Items]
Current portion of debt	$ 500	0
Interest rate, stated percentage	5.00%
Trust I Preferred Securities, 4.75% due March 2028(c) | Capital Trust I
Debt Instrument [Line Items]
Current portion of debt	$ 111	111
Interest rate, stated percentage	4.75%
Liquidation preference	$ 50
KMGP, $1,000 Liquidation Value Series A Fixed-to-Floating Rate Term Cumulative Preferred Stock, due August 2057(d) | Kinder Morgan G.P., Inc.
Debt Instrument [Line Items]
Current portion of debt	$ 0	$ 100
Liquidation preference		$ 1,000
Other debt
Debt Instrument [Line Items]
Current portion of debt	$ 47	$ 45

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- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Weighted average interest rate of debt outstanding.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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