Joint Arrangements - Summary of Interest Percentage in Joint Ventures (Detail)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
North West Shelf Gas Pty Ltd [member]
Disclosure of joint ventures [line items]
Principal activity	Contract administration services for venturers for LNG sales to Japan. Marketing and administration services for venturers for gas processing.
Group Interest	33.30%	33.30%
North West Shelf Liaison Company Pty Ltd [member]
Disclosure of joint ventures [line items]
Principal activity	Liaison for ventures in the sale of LNG to the Japanese market.
Group Interest	33.30%	33.30%
China Administration Company Pty Ltd [member]
Disclosure of joint ventures [line items]
Principal activity	Contract administration services for venturers for LNG sales to China.
Group Interest	33.30%	33.30%
North West Shelf Shipping Service Company Pty Ltd [member]
Disclosure of joint ventures [line items]
Principal activity	LNG vessel fleet advisor.
Group Interest	33.30%	33.30%
North West Shelf Lifting Coordinator Pty Ltd [member]
Disclosure of joint ventures [line items]
Principal activity	Allocating, scheduling and administering the lifting of LNG and pipeline gas.
Group Interest	33.30%	33.30%

Contract administration services for venturers for LNG sales to Japan. Marketing and administration services for venturers for gas processing.

Liaison for ventures in the sale of LNG to the Japanese market.

Contract administration services for venturers for LNG sales to China.

LNG vessel fleet advisor.

Allocating, scheduling and administering the lifting of LNG and pipeline gas.