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Debt and Capital Structure - Schedule Remaining Principal Amounts of U.S. Dollar Denominated Unsecured Notes (Detail)
$ in Millions, $ in Millions
Jan. 10, 2022
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Oct. 31, 2021
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 7,400     $ 5,900  
Long-Term Debt            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   7,385 $ 12,113   5,898 $ 7,510
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   7,385 9,363   5,898 7,510
3.95% due April 15, 2022 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Long-term debt, interest rate       3.95%    
3.00% due August 15, 2022 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 0 $ 0   500 637
Long-term debt, interest rate   3.00% 3.00%      
3.80% due September 15, 2023 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 115 $ 146   450 573
Long-term debt, interest rate 3.80% 3.80% 3.80%      
4.00% due April 15, 2024 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 269 $ 341   0 0
Long-term debt, interest rate 4.00% 4.00% 4.00% 4.00%    
5.38% due July 15, 2025 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 666 $ 844   1,000 1,273
Long-term debt, interest rate   5.38% 5.38%      
4.25% due April 15, 2027 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 962 $ 1,220   962 1,225
Long-term debt, interest rate   4.25% 4.25%      
4.40% due April 15, 2029 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 750 $ 951   0 0
Long-term debt, interest rate   4.40% 4.40%      
2.65% due January 15, 2032 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 500 $ 634   0 0
Long-term debt, interest rate   2.65% 2.65%      
5.25% due June 15, 2037 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 583 $ 739   583 742
Long-term debt, interest rate   5.25% 5.25%      
6.80% due September 15, 2037 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 387 $ 490   0 0
Long-term debt, interest rate   6.80% 6.80%      
6.75% due November 15, 2039 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 1,390 $ 1,763   1,390 1,770
Long-term debt, interest rate   6.75% 6.75%      
4.45% due September 15, 2042 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 155 $ 197   155 198
Long-term debt, interest rate   4.45% 4.45%      
5.20% due September 15, 2043 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 58 $ 73   58 74
Long-term debt, interest rate   5.20% 5.20%      
5.40% due June 15, 2047 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 800 $ 1,014   800 1,018
Long-term debt, interest rate   5.40% 5.40%      
3.75% due February 15, 2052 | Long-Term Debt | U.S. Dollar Denominated Unsecured Notes            
Disclosure of detailed information about borrowings [line items]            
Total debt principal   $ 750 $ 951   $ 0 $ 0
Long-term debt, interest rate   3.75% 3.75%