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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Composite depreciation rate, low	0.08%
Composite depreciation rate, high	33.30%

X

- Definition

Composite depreciation rate, high

+ References

No definition available.

+ Details

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Namespace Prefix:	kmi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Composite depreciation rate, low

+ References

No definition available.

+ Details

Name:	kmi_CompositeDepreciationRateLow
Namespace Prefix:	kmi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration