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EMPLOYEE BENEFIT PLANS - Plan Assets (Details)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Domestic and international equities	32.00%
Long duration fixed income	55.00%
Return-seeking credit	5.00%
Hedge funds	5.00%
Real estate funds	3.00%
Total	100.00%

X

- Definition

Target allocation percentage in hedge fund investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

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X

- Definition

Target allocation percentage in long duration fixed income securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

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Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Target allocation percentage in global real estate investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

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X

- Definition

Target allocation percentage in return-seeking credit securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

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Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
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X

- Definition

Target allocation percentage to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

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Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Target allocation percentage in domestic and international equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

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Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
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X

- References

No definition available.

+ Details

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