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BORROWINGS - Corporate Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2021
May 24, 2021
Dec. 31, 2020
Apr. 07, 2020
Oct. 07, 2019
Disclosure of detailed information about borrowings [line items]          
Deferred financing costs and other $ (20)   $ (15)    
Current and non-current portion of corporate borrowings 2,719   3,158    
Senior Unsecured Revolving Credit Facility - Maturing June 28, 2024          
Disclosure of detailed information about borrowings [line items]          
Total $ 0   1,131    
Senior Unsecured Revolving Credit Facility - Maturing June 28, 2024 | Floating interest rate          
Disclosure of detailed information about borrowings [line items]          
Borrowings, adjustment to interest rate basis 1.20%        
Borrowings, adjustment to interest rate basis 1.20%        
Senior Unsecured Revolving Credit Facility - Maturing April 14, 2022          
Disclosure of detailed information about borrowings [line items]          
Total $ 0   0    
Medium Term Notes, Public - Canadian - Maturing February 22, 2024          
Disclosure of detailed information about borrowings [line items]          
Total $ 237   236    
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual rate 3.30%        
Medium Term Notes, Public - Canadian - Maturing February 22, 2024          
Disclosure of detailed information about borrowings [line items]          
Total $ 317   314    
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual rate 3.30%        
Medium-term Notes, Maturing September 11, 2028          
Disclosure of detailed information about borrowings [line items]          
Total $ 554   550    
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual rate 4.20%        
Medium-term Notes, Maturing October 9, 2029          
Disclosure of detailed information about borrowings [line items]          
Annual rate       3.40% 3.50%
Total $ 554   550    
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual rate 3.40%        
Medium-term Notes, Maturing September 1, 2032          
Disclosure of detailed information about borrowings [line items]          
Total $ 396   392    
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual rate 2.90%        
Subordinated notes, Maturing 2081          
Disclosure of detailed information about borrowings [line items]          
Annual rate   5.00%      
Total $ 250 $ 250 0    
Subordinated notes, Maturing 2081 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual rate 5.00%        
Corporate borrowings          
Disclosure of detailed information about borrowings [line items]          
Total $ 2,739   3,173    
Commercial Paper Program          
Disclosure of detailed information about borrowings [line items]          
Total $ 431   $ 0    
Commercial Paper Program | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual rate 0.37%