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BORROWINGS - Corporate Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Corporate revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 0 $ 510
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, Public - Canadian - Maturing October 30, 2020    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 286 275
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]    
Subsidiary and corporate borrowings $ 344 330
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]    
Subsidiary and corporate borrowings $ 229 220
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]    
Subsidiary and corporate borrowings $ 305 293
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]    
Subsidiary and corporate borrowings $ 382 365
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 4.20%  
Corporate borrowings    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 1,546 $ 1,993