Assets Held For Sale (Details) - CAD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2020 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
Long Lived Assets Held-for-sale [Line Items] | ||||
Loss on assets held for sale | $ 0 | $ (137) | $ 486 | |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | ||||
Long Lived Assets Held-for-sale [Line Items] | ||||
Assets held for sale | 260 | |||
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Track and Roadway [Member] | ||||
Long Lived Assets Held-for-sale [Line Items] | ||||
Impairment loss, pre-tax | $ 486 | |||
Loss on assets held for sale | $ 363 | |||
Non-Core Lines [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | ||||
Long Lived Assets Held-for-sale [Line Items] | ||||
Loss recovery, pre-tax | 137 | |||
Loss recovery, after-tax | $ 102 |