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Debt and Capital Structure - Schedule of Long-Term Debt (Detail)
$ in Millions, $ in Billions
Oct. 20, 2021
USD ($)
Sep. 30, 2021
CAD ($)
Jan. 01, 2021
CAD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Disclosure of detailed information about borrowings [line items]          
Net Debt Premiums (Discounts) and Transaction Costs   $ 286     $ (69)
Long-Term Debt   12,986     7,441
Less: Current Portion   545     0
Long-Term Portion   12,441     7,441
The Arrangement          
Disclosure of detailed information about borrowings [line items]          
Debt premiums   369      
U.S. Dollar Denominated Unsecured Notes          
Disclosure of detailed information about borrowings [line items]          
Long-Term Debt $ 7.4        
U.S. Dollar Denominated Unsecured Notes | The Arrangement          
Disclosure of detailed information about borrowings [line items]          
Long-Term Debt     $ 3,000 $ 2.4  
Long-Term Debt          
Disclosure of detailed information about borrowings [line items]          
Total Debt Principal, (CAD equivalent)   12,700     7,510
Long-Term Debt | Revolving Term Debt          
Disclosure of detailed information about borrowings [line items]          
Revolving Term Debt   0     0
Long-Term Debt | Canadian Dollar Unsecured Notes          
Disclosure of detailed information about borrowings [line items]          
Total Debt Principal, (CAD equivalent)   2,750     0
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes          
Disclosure of detailed information about borrowings [line items]          
Total Debt Principal, (CAD equivalent)   $ 9,950     $ 7,510