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BORROWINGS - Corporate Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Corporate revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 1,210 $ 820
Corporate revolving credit facility | Floating interest rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings, adjustment to interest rate basis 1.20%  
Syndicated Revolving Credit Facility [Member]    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 0 0
Syndicated Revolving Credit Facility [Member] | Floating interest rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings, adjustment to interest rate basis 2.10%  
Medium Term Notes, Public - Canadian - Maturing March 11, 2022    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 331 346
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]    
Subsidiary and corporate borrowings $ 221 231
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]    
Subsidiary and corporate borrowings $ 294 308
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 [Domain]    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 516 384
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 4.20%  
Medium-term Notes, Maturing October 9, 2029 [Domain]    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 516 386
Medium-term Notes, Maturing October 9, 2029 [Domain] | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 3.40%  
Corporate borrowings    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 3,074 2,475
Corporate Borrowings, Outstanding Principal 3,088 2,475
Corporate Borrowings, Deferred Financing Costs and Other $ (14) $ 0