Description of the Plan (Details) - EBP 002	12 Months Ended
Dec. 31, 2025 USD ($)
Contributions
Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage	1.00%
Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage	50.00%
Automatic contribution rate	6.00%
Participant Contribution, Automatic Annual Increase Rate	1.00%
Employer contribution rate	5.00%
Company contribution vesting period	2 years
Maximum Participant Account Balance, Involuntary Lump-Sum Distribution	$ 1,000
Maximum Participant Account Balance, Automatic Rollover Designated By Committee	7,000
Maximum Participant Account Balance, Eligible for Voluntary Distribution Options	7,000
Notes Receivable from Participants
Minimum borrowing amount	$ 1,000
Maximum percent of vested balance	50.00%
Maximum borrowing amount	$ 50,000
Basis spread on interest rate	2.00%
Forfeitures
Terminated participants forfeited of Company contribution	$ 2,065,000
Forfeited balances used to reduce Company contributions	$ 2,493,000

EBP, Employer Contribution, Percentage

No definition available.

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- Definition

EBP, Employer Contribution Vesting Period

+ References

No definition available.

+ Details

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- Definition

EBP, Maximum Participant Account Balance, Automatic Rollover Designated By Committee

+ References

No definition available.

+ Details

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- Definition

EBP, Maximum Participant Account Balance, Eligible for Voluntary Distribution Options

+ References

No definition available.

+ Details

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- Definition

EBP, Maximum Participant Account Balance, Involuntary Lump-Sum Distribution

+ References

No definition available.

+ Details

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- Definition

EBP, Participant Contribution, Automatic Annual Increase Rate

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

EBP, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage

+ References

No definition available.

+ Details

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- Definition

EBP, Participant Loan, Basis Spread On Interest Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	kmi_
Data Type:	dtr-types:percentItemType
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Period Type:	duration

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount of decrease in forfeited nonvested account of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from employer contribution.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(5)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

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- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.

+ References

+ Details

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- References

No definition available.

+ Details

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- Details

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