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Long-term debt (Tables)
12 Months Ended
Dec. 31, 2021
Financial Instruments [Abstract]  
Summary of long-term debt
FOR THE YEAR ENDED DECEMBER 31 NOTE WEIGHTED
 AVERAGE
INTEREST RATE
AT DECEMBER 31, 2021
  2021 2020
Notes payable(1)
29 0.07  % 735  392 
Loans secured by trade receivables 29 1.10  % 900  1,050 
Long-term debt due within one year(2)
25 4.01  % 990  975 
Total debt due within one year       2,625  2,417 
(1)Includes commercial paper of $561 million in U.S. dollars ($711 million in Canadian dollars) and $274 million in U.S. dollars ($349 million in Canadian dollars) as at December 31, 2021 and December 31, 2020, respectively, which were issued under our U.S. commercial paper program and have been hedged for foreign currency fluctuations through forward currency contracts. See Note 29, Financial and capital management, for additional details.
(2)Included in long-term debt due within one year is the current portion of lease liabilities of $864 million and $754 million as at December 31, 2021 and December 31, 2020, respectively.
FOR THE YEAR ENDED DECEMBER 31 NOTE WEIGHTED
 AVERAGE
INTEREST RATE AT DECEMBER 31, 2021
MATURITY 2021 2020
Debt securities            
1997 trust indenture   3.67  % 2023-2051 16,750  16,400 
1976 trust indenture   9.38  % 2027-2054 975  1,100 
2011 trust indenture 4.00  % 2024 225  225 
2016 U.S. trust indenture (1)
3.26  % 2024-2052 5,188  2,228 
1996 trust indenture (subordinated)   8.21  % 2026-2031 275  275 
Lease liabilities 4.13  % 2022-2065 4,309  4,356 
Other         438  386 
Total debt         28,160  24,970 
Net unamortized discount         (26) (19)
Unamortized debt issuance costs         (96) (70)
Less:        
Amount due within one year 24       (990) (975)
Total long-term debt         27,048  23,906 
(1)At December 31, 2021 and 2020, notes issued under the 2016 U.S. trust indenture totaled $4,100 million and $1,750 million in U.S. dollars, respectively, and have been hedged for foreign currency fluctuations through cross currency interest rate swaps. See Note 29, Financial and capital management, for additional details.