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Risk Management Activities - Non-Hedges (Details) $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2022 AUD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 AUD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($)
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Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  | $ 3 |  |  | $ 2 |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026, 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, 2023-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  | (12) |  |  |  |
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 receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2022-2025, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  |  |  |  | (5) |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2022-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  |  |  |  | 8 |
Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2022 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  | 3 |  |  | 1 |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026, Contract One |  |  |  |  |  |
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, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  | 102 |  |  |  |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2022-2025, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  | $ 28 |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026, Contract One |  |  |  |  |  |
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 receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2022-2025, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  |  | 26 |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2022-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  |  | 357 |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2022 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  | $ 159 |  |  | $ 191 |
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, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  | 66 |  |  |
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2022-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  |  |  | $ 271
USD | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2022 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  | $ 120 |  |  | $ 150

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