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Receivables, Prepayments and Other Assets - Schedule of Unbilled Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Trade and other current receivables [abstract]
Balance, beginning of period	$ 81	$ 38
Revenue recognized during the period	53	177
Amounts invoiced	(28)	(135)
Other	0	1
Balance, end of period	$ 106	$ 81