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Debt and Capital Structure - Schedule Remaining Principal Amounts of U.S. Dollar Denominated Unsecured Notes (Detail) - Long-Term Debt
$ in Millions, $ in Millions
Jun. 30, 2022
USD ($)
Jun. 30, 2022
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 7,001 $ 11,021 $ 7,385 $ 12,113
U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal 7,001 9,021 7,385 9,363
Canadian Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   2,000   2,750
3.80% due September 15, 2023 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 0 $ 0 115 146
Long-term debt, interest rate 3.80% 3.80%    
4.00% due April 15, 2024 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 0 $ 0 269 341
Long-term debt, interest rate 4.00% 4.00%    
5.38% due July 15, 2025 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 666 $ 858 666 844
Long-term debt, interest rate 5.38% 5.38%    
4.25% due April 15, 2027 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 962 $ 1,239 962 1,220
Long-term debt, interest rate 4.25% 4.25%    
4.40% due April 15, 2029 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 750 $ 967 750 951
Long-term debt, interest rate 4.40% 4.40%    
2.65% due January 15, 2032 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 500 $ 644 500 634
Long-term debt, interest rate 2.65% 2.65%    
5.25% due June 15, 2037 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 583 $ 751 583 739
Long-term debt, interest rate 5.25% 5.25%    
6.80% due September 15, 2037 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 387 $ 498 387 490
Long-term debt, interest rate 6.80% 6.80%    
6.75% due November 15, 2039 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 1,390 $ 1,792 1,390 1,763
Long-term debt, interest rate 6.75% 6.75%    
4.45% due September 15, 2042 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 155 $ 200 155 197
Long-term debt, interest rate 4.45% 4.45%    
5.20% due September 15, 2043 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 58 $ 74 58 73
Long-term debt, interest rate 5.20% 5.20%    
5.40% due June 15, 2047 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 800 $ 1,031 800 1,014
Long-term debt, interest rate 5.40% 5.40%    
3.75% due February 15, 2052 | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 750 $ 967 $ 750 951
Long-term debt, interest rate 3.75% 3.75%    
3.55% due March 12, 2025 | Canadian Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   $ 0   750
Long-term debt, interest rate 3.55% 3.55%    
3.60% due March 10, 2027 | Canadian Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   $ 750   750
Long-term debt, interest rate 3.60% 3.60%    
3.50% due February 7, 2028 | Canadian Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   $ 1,250   $ 1,250
Long-term debt, interest rate 3.50% 3.50%