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Debt and Capital Structure - Schedule Remaining Principal Amounts of U.S. Dollar Denominated Unsecured Notes (Detail)
$ in Millions, $ in Millions
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Total debt principal     $ 7,400  
Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   $ 8,537   $ 12,113
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 4,827 $ 6,537 7,385 9,363
3.80% due September 15, 2023 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 3.80% 3.80%    
Total debt principal $ 0 $ 0 115 146
4.00% due April 15, 2024 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 4.00% 4.00%    
Total debt principal $ 0 $ 0 269 341
5.38% due July 15, 2025 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 5.38% 5.38%    
Total debt principal $ 133 $ 181 666 844
4.25% due April 15, 2027 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 4.25% 4.25%    
Total debt principal $ 373 $ 505 962 1,220
4.40% due April 15, 2029 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 4.40% 4.40%    
Total debt principal $ 240 $ 324 750 951
2.65% due January 15, 2032 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 2.65% 2.65%    
Total debt principal $ 500 $ 677 500 634
5.25% due June 15, 2037 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 5.25% 5.25%    
Total debt principal $ 583 $ 790 583 739
6.80% due September 15, 2037 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 6.80% 6.80%    
Total debt principal $ 387 $ 524 387 490
6.75% due November 15, 2039 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 6.75% 6.75%    
Total debt principal $ 935 $ 1,267 1,390 1,763
4.45% due September 15, 2042 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 4.45% 4.45%    
Total debt principal $ 97 $ 131 155 197
5.20% due September 15, 2043 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 5.20% 5.20%    
Total debt principal $ 29 $ 39 58 73
5.40% due June 15, 2047 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 5.40% 5.40%    
Total debt principal $ 800 $ 1,083 800 1,014
3.75% due February 15, 2052 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Long-term debt, interest rate 3.75% 3.75%    
Total debt principal $ 750 $ 1,016 $ 750 $ 951