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Risk Management Activities - Non-Hedges (Details) $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2023 AUD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 AUD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($)
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Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  | $ 5 |  |  |  |
Fair value asset |  |  |  |  | $ 3 |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  | (1) |  |  |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  | 19 |  |  |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  |  |  |  | (1) |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  |  |  |  | (12) |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  | 5 |  |  |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  |  |  |  | 4 |
Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  | (4) |  |  |  |
Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  |  |  |  | 3 |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold | $ 125 |  |  |  |  |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  | $ 183 |  |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased | $ 152 |  |  |  |  |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  | $ 102 |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  | 113 |  |  |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  | 1,113 |  |  |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  |  | 168 |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  |  | 761 |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  | $ 190 |  |  |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  |  | $ 159 |
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  | $ 828 |  |  |
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  |  |  | $ 573
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  | 100 |  |  |
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  |  |  | 66
USD | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  | $ 140 |  |  |
USD | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  |  |  | $ 120

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