INTANGIBLE ASSETS INCLUDING GOODWILL - Intangible Assets Activity (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Intangible assets
Net carrying amount of intangible assets increase (decrease)	$ (4)
Intangible asset amortization expense	15	$ 15
Capitalized software
Intangible assets
Intangible asset amortization expense	$ 9	$ 8

The aggregate expense net of any currency impact charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

No definition available.

Name:	kd_AmortizationOfIntangibleAssetsNetOfCurrencyImpact
Namespace Prefix:	kd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration