Income Taxes - Schedule of Amount and Expiration Dates of Operating Loss and Tax Credit Carry-forwards (Details) $ in Millions	Dec. 31, 2023 USD ($)
Canadian net operating loss carryforwards
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	$ 588
Canadian capital loss carryforwards
Operating Loss And Tax Credit Carryforwards [Line Items]
Capital loss carryforwards	161
Canadian tax credits
Operating Loss And Tax Credit Carryforwards [Line Items]
U.S. foreign tax credits	5
U.S. federal net operating loss carryforward
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	51
U.S. state net operating loss carryforwards
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	519
U.S. capital loss carryforwards
Operating Loss And Tax Credit Carryforwards [Line Items]
Capital loss carryforwards	17
U.S. foreign tax credits
Operating Loss And Tax Credit Carryforwards [Line Items]
U.S. foreign tax credits	45
Foreign tax credits
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	161
Capital loss carryforwards	29
Other foreign net operating loss carryforwards
Operating Loss And Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	130
Other foreign credits
Operating Loss And Tax Credit Carryforwards [Line Items]
U.S. foreign tax credits	$ 703