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INVESTMENTS, DEBT AND DERIVATIVES - Financial Assets, Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
Indemnity receivable from VEON Amsterdam B.V.
Disclosure of fair value measurement of assets [line items]
Financial assets at amortised cost	$ 28	$ 40
Increase (decrease) in financial assets	(12)
Security deposits and cash collateral
Disclosure of fair value measurement of assets [line items]
Financial assets at amortised cost	91	119
Sovereign Ukrainian Bonds
Disclosure of fair value measurement of assets [line items]
Financial assets at amortised cost	$ 40	$ 0

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