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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2019
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Summary of Commitments through Purchase and Sale Transactions of Investments
    
                               
2019
                            
  
                         2018                     
    
        
Purchase
    
            Sale  
          Purchase              Sale  
Real estate
  168    3    156  66  
Mortgage loans
  859    79    3,187  67  
Private loans
  394    -    1,224  -  
Other
  1,824    -    2,222  -  
Summary of Future Minimum Lease Payments under Non-cancellable Operating Leases
Future lease payments
 
   
< 1 year
amounts
    
1 < 2 years
amounts
    2 < 3 years
amounts
    3 < 4 years
amounts
    
4 < 5 years
amounts
    
    > 5 years  
    amounts  
2019
                     
Operating lease rights
 49    42    32    26    19    47  
  < 1 year
amounts
    1 - 5 years
amounts
    > 5 years
amounts
               
2018
                           
Operating lease obligations
 73    144    169            
Operating lease rights
 50    127    52    
 
    
 
    
 
Summary of Other Commitments and Contingencies
Other commitments and contingencies
 
    
                         2019    
                          2018 
Guarantees
   380    437 
Standby letters of credit
   12    12 
Share of contingent liabilities incurred in relation to interests in joint ventures
   14    49 
Other guarantees
   13    14 
Other commitments and contingent liabilities
   7    7