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BORROWINGS - Corporate Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 10, 2018
Dec. 31, 2017
Apr. 17, 2017
Feb. 22, 2017
Corporate revolving credit facility          
Disclosure of detailed information about borrowings [line items]          
Non-recourse borrowings $ 510   $ 789    
Corporate revolving credit facility | Floating interest rate          
Disclosure of detailed information about borrowings [line items]          
Borrowings, adjustment to interest rate basis 1.20%        
Medium Term Notes, Maturing October 30, 2018          
Disclosure of detailed information about borrowings [line items]          
Non-recourse borrowings $ 0   99    
Medium Term Notes, Maturing October 30, 2018 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual Rate 3.00%        
Medium Term Notes, Public - Canadian - Maturing October 30, 2020          
Disclosure of detailed information about borrowings [line items]          
Non-recourse borrowings $ 275   298    
Medium Term Notes, Public - Canadian - Maturing October 30, 2020 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual Rate 3.50%        
Medium Term Notes, Public - Canadian - Maturing March 11, 2022          
Disclosure of detailed information about borrowings [line items]          
Non-recourse borrowings $ 330   358    
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]          
Non-recourse borrowings $ 220   239    
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual Rate 3.30%     3.30% 3.30%
Medium Term Notes, Public - Canadian - Maturing February 22, 2024          
Disclosure of detailed information about borrowings [line items]          
Non-recourse borrowings $ 293   318    
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 [Domain]          
Disclosure of detailed information about borrowings [line items]          
Non-recourse borrowings $ 365   0    
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Annual Rate 4.20% 4.20%      
Corporate borrowings          
Disclosure of detailed information about borrowings [line items]          
Non-recourse borrowings $ 1,993   $ 2,101