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Accumulated Other Comprehensive Income (Loss) (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure Of Accumulated Other Comprehensive Income Loss [Abstract]  
Summary of Accumulated Other Comprehensive Income (Loss)
Pension and Other Post-Retirement BenefitsPrivate Equity InstrumentsForeign Currency Translation AdjustmentTotal
As at December 31, 2019(2)27802827
Other Comprehensive Income (Loss), Before Tax(10)(44)(54)
Income Tax (Expense) Recovery22
As at December 31, 2020(10)27758775
Other Comprehensive Income (Loss), Before Tax47(129)(82)
Income Tax (Expense) Recovery(9)(9)
As at December 31, 20212827629684