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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details)
$ in Millions, $ in Millions
Jun. 30, 2022
USD ($)
Apr. 21, 2022
CAD ($)
Dec. 31, 2021
USD ($)
May 24, 2021
USD ($)
Medium-term Notes, Maturing April 25, 2034        
Disclosure of information about consolidated structured entities [line items]        
Notional amount   $ 600    
Subsidiary and corporate borrowings $ 311   $ 0  
Medium-term Notes, Maturing April 25, 2034 Tranche One        
Disclosure of information about consolidated structured entities [line items]        
Notional amount   400    
Medium-term Notes, Maturing April 25, 2034 Tranche Two        
Disclosure of information about consolidated structured entities [line items]        
Notional amount   $ 200    
Subordinated notes, Maturing May 24, 2081        
Disclosure of information about consolidated structured entities [line items]        
Borrowings, interest rate       5.00%
Subsidiary and corporate borrowings       $ 250
Fixed interest rate | Medium-term Notes, Maturing April 25, 2034        
Disclosure of information about consolidated structured entities [line items]        
Borrowings, interest rate 5.40%      
Fixed interest rate | Medium-term Notes, Maturing April 25, 2034 Tranche One        
Disclosure of information about consolidated structured entities [line items]        
Borrowings, interest rate   5.439%    
Fixed interest rate | Medium-term Notes, Maturing April 25, 2034 Tranche Two        
Disclosure of information about consolidated structured entities [line items]        
Borrowings, interest rate   5.789%