Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Billions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2025
USD ($)
$ / $
|
Sep. 30, 2025
USD ($)
$ / $
|
Sep. 30, 2025
CAD ($)
$ / $
|
Dec. 31, 2024
USD ($)
|
|
| Recurring Fair Value Measures | ||||
| Derivatives and Risk Management Activities | ||||
| Fair value, asset | $ 66 | $ 66 | $ 24 | |
| Foreign currency derivatives | ||||
| Derivatives and Risk Management Activities | ||||
| Notional amount of derivatives | $ 4.5 | |||
| Gains recognized | $ 90 | $ 41 | ||
| Average fixed exchange rate (cad per usd) | $ / $ | 1.37 | 1.37 | 1.37 | |
| Average exchange rate (cad per usd) | $ / $ | 1.38 | 1.38 | 1.38 | |
| Foreign currency derivatives | Recurring Fair Value Measures | ||||
| Derivatives and Risk Management Activities | ||||
| Fair value, asset | $ 41 | $ 41 | $ 0 |