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BORROWINGS - Corporate Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Apr. 07, 2020
Dec. 31, 2019
Oct. 07, 2019
Disclosure of detailed information about borrowings [line items]        
Deferred financing costs and other $ (15)   $ 0  
Corporate borrowings 3,158   2,475  
Senior Unsecured Revolving Credit Facility - Maturing June 28, 2024        
Disclosure of detailed information about borrowings [line items]        
Total $ 1,131   820  
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 March 11, 2022        
Disclosure of detailed information about borrowings [line items]        
Total $ 0   346  
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 3.50%      
Medium Term Notes, Public - Canadian - Maturing February 22, 2024        
Disclosure of detailed information about borrowings [line items]        
Total $ 236   231  
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 $ 314   308  
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 $ 550   384  
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 $ 550   386  
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 $ 392   0  
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 2.90%      
Corporate borrowings        
Disclosure of detailed information about borrowings [line items]        
Total $ 3,173   $ 2,475