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BORROWINGS - Corporate Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Corporate revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 0 $ 1,131
Corporate revolving credit facility | Floating interest rate    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 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]    
Annual Rate 1.20%  
Commercial Paper    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 496 0
Commercial Paper | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 0.40%  
Medium Term Notes, Public - Canadian - Maturing February 22, 2024    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 242 236
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 $ 323 314
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 $ 565 550
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 $ 565 550
Medium-term Notes, Maturing October 9, 2029 [Domain] | 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]    
Subsidiary and corporate borrowings $ 403 392
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 2.90%  
Subordinated Notes, Maturing May 24, 2081    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 250 0
Subordinated Notes, Maturing May 24, 2081 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 5.00%  
Corporate borrowings    
Disclosure of detailed information about borrowings [line items]    
Subsidiary and corporate borrowings $ 2,822 3,158
Corporate Borrowings, Outstanding Principal 2,844 3,173
Corporate Borrowings, Deferred Financing Costs and Other $ (22) $ (15)