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Financing Receivables - Credit Quality - Commercial Mortgage Loans by Region (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
[1]
Financing receivables - credit quality information        
Less: allowance for loan losses $ 51 $ 68 $ 71 $ 51
Commercial Loans        
Financing receivables - credit quality information        
Less: allowance for loan losses 48 66 $ 67 $ 51
Commercial Loans | Commercial mortgage loans        
Financing receivables - credit quality information        
Loans 1,901 2,725    
Less: allowance for loan losses 14 29    
Total loans 1,887 2,696    
Commercial Loans | Commercial mortgage loans | East North Central        
Financing receivables - credit quality information        
Loans 187 259    
Commercial Loans | Commercial mortgage loans | East South Central        
Financing receivables - credit quality information        
Loans 69 115    
Commercial Loans | Commercial mortgage loans | Middle Atlantic        
Financing receivables - credit quality information        
Loans 125 178    
Commercial Loans | Commercial mortgage loans | Mountain        
Financing receivables - credit quality information        
Loans 124 247    
Commercial Loans | Commercial mortgage loans | New England        
Financing receivables - credit quality information        
Loans 29 54    
Commercial Loans | Commercial mortgage loans | Pacific        
Financing receivables - credit quality information        
Loans 608 825    
Commercial Loans | Commercial mortgage loans | South Atlantic        
Financing receivables - credit quality information        
Loans 496 681    
Commercial Loans | Commercial mortgage loans | West North Central        
Financing receivables - credit quality information        
Loans 140 198    
Commercial Loans | Commercial mortgage loans | West South Central        
Financing receivables - credit quality information        
Loans $ 123 $ 168    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans        
Financing receivables - credit quality information        
Percentage of total 100.00% 100.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | East North Central        
Financing receivables - credit quality information        
Percentage of total 10.00% 10.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | East South Central        
Financing receivables - credit quality information        
Percentage of total 4.00% 4.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Middle Atlantic        
Financing receivables - credit quality information        
Percentage of total 7.00% 7.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Mountain        
Financing receivables - credit quality information        
Percentage of total 6.00% 9.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | New England        
Financing receivables - credit quality information        
Percentage of total 2.00% 2.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | Pacific        
Financing receivables - credit quality information        
Percentage of total 32.00% 30.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | South Atlantic        
Financing receivables - credit quality information        
Percentage of total 26.00% 25.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | West North Central        
Financing receivables - credit quality information        
Percentage of total 7.00% 7.00%    
Total commercial mortgage loans | Credit concentration risk | Commercial Loans | Commercial mortgage loans | West South Central        
Financing receivables - credit quality information        
Percentage of total 6.00% 6.00%    
[1] Prior to January 1, 2020, the allowance for credit losses was based on an incurred loss model that did not require estimating expected credit losses over the expected life of the asset.