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BORROWINGS - Corporate Borrowings (Details) - USD ($)
Mar. 13, 2018
Dec. 31, 2017
Apr. 17, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings   $ 10,164,000,000   $ 8,326,000,000
Corporate revolving credit facility        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings   $ 789,000,000   0
Unused commitment fee   0.18%    
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 10, 2017        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings   $ 0   295,000,000
Medium Term Notes, Public - Canadian - Maturing October 10, 2017 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate   3.50%    
Medium Term Notes, Public - Canadian - Maturing October 30, 2018        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings   $ 99,000,000   93,000,000
Medium Term Notes, Public - Canadian - 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]        
Subsidiary and corporate borrowings   $ 298,000,000   279,000,000
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   $ 358,000,000   335,000,000
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   $ 239,000,000   0
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%  
Medium Term Notes, Public - Canadian - Maturing February 22, 2024        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings   $ 318,000,000   0
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate   3.30%    
Revolving credit facility with Brookfield        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings   $ 0   $ 0
Revolving credit facility with Brookfield | Floating interest rate        
Disclosure of detailed information about borrowings [line items]        
Borrowings, adjustment to interest rate basis   2.00%    
Subsequent Event | Revolving credit facility with Brookfield        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 400,000,000