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Contingencies and Commitments (Details) - Pending litigation $ in Millions, $ in Millions		1 Months Ended
	Dec. 13, 2016 AUD ($) claim	Jun. 30, 2025 USD ($)	Mar. 31, 2025 AUD ($)	Mar. 31, 2025 USD ($)	Nov. 30, 2024 USD ($)	Mar. 31, 2023 referee	Apr. 30, 2025 USD ($)
Santos Ltd
Loss Contingencies [Line Items]
Damages sought	$ 1,470
Number of referees appointed | referee						3
Estimate of possible loss	$ 236
Santos Ltd Claim 1
Loss Contingencies [Line Items]
Number of claims | claim	1
Panel referred damages awarded from other party	$ 700
Santos Ltd Claim 2
Loss Contingencies [Line Items]
Panel referred damages awarded from other party	$ 790
North Texas Tollway Authority
Loss Contingencies [Line Items]
Damages awarded			$ 280		$ 280
Panel referred damages awarded from other party interest amount				$ 133
Panel referred damages awarded for legal expenses				$ 415
Loss contingency receivable							$ 84
Payments for legal settlements		$ 33

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