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Other Financial Assets and Liabilities - Summary of Hedging Activities (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
MMBTU
MMBbls
TBTU
us-au
AUD ($)
Dec. 31, 2023
USD ($)
MMBbls
AUD ($)
MMBTU
TBTU
us-au
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, liabilities $ 349 $ 35
Brent commodity swaps [Member] | Cash flow hedges [member]    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets $ 137  
Carrying amount, liabilities   $ (14)
Notional amount | MMBbls [1] 31 29
Maturity date 2025 2024
Hedge ratio 1:1 1:1
Weighted average hedged rate | MMBbls 79 76
HH Natural Gas commodity swaps [Member] | Top of range [member]    
Disclosure of detailed information about hedging instruments [line items]    
Maturity date 2026  
HH Natural Gas commodity swaps [Member] | Bottom of range [member]    
Disclosure of detailed information about hedging instruments [line items]    
Maturity date 2025  
HH Natural Gas commodity swaps [Member] | Cash flow hedges [member]    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets $ 8  
Carrying amount, liabilities   $ (44)
Notional amount | TBTU [1] 79 38
Hedge ratio 1:1 1:1
Weighted average hedged rate | MMBTU 3.6 4.4
HH Natural Gas commodity swaps [Member] | Cash flow hedges [member] | Top of range [member]    
Disclosure of detailed information about hedging instruments [line items]    
Maturity date   2025
HH Natural Gas commodity swaps [Member] | Cash flow hedges [member] | Bottom of range [member]    
Disclosure of detailed information about hedging instruments [line items]    
Maturity date   2024
TTF LNG commodity swaps [Member] | Cash flow hedges [member]    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets   $ 181
Carrying amount, liabilities $ (118)  
Notional amount | TBTU [1] 69 32
Hedge ratio 1:1 1:1
Weighted average hedged rate | MMBTU 11.9 18.3
TTF LNG commodity swaps [Member] | Cash flow hedges [member] | Top of range [member]    
Disclosure of detailed information about hedging instruments [line items]    
Maturity date 2026 2025
TTF LNG commodity swaps [Member] | Cash flow hedges [member] | Bottom of range [member]    
Disclosure of detailed information about hedging instruments [line items]    
Maturity date 2025 2024
Interest rate swap contract [member] | Cash flow hedges [member]    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets $ 35 $ 43
Notional amount [1] 600 600
Maturity date 2027 2027
Hedge ratio 1:1 1:1
Weighted average hedged rate 0.017 0.017
FX Forwards [member] | Cash flow hedges [member]    
Disclosure of detailed information about hedging instruments [line items]    
Carrying amount, assets   $ 8
Carrying amount, liabilities $ (45)  
Notional amount [1],[2] 2,484 1,834
Maturity date 2025  
Hedge ratio 1:1 1:1
Weighted average hedged rate | us-au 0.67 0.68
FX Forwards [member] | Cash flow hedges [member] | Top of range [member]    
Disclosure of detailed information about hedging instruments [line items]    
Maturity date   2025
FX Forwards [member] | Cash flow hedges [member] | Bottom of range [member]    
Disclosure of detailed information about hedging instruments [line items]    
Maturity date   2024
[1] The notional amounts relate to unrealised volumes of the hedge item included in the cash flow hedge reserve.
[2] This notional amount represents total since inception of which AUD$985 million is unrealised volumes of the hedge item included in the cash flow hedge reserve.