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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans $ 976 $ 1,047
Category 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 53 59
Category 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 897 952
Categories 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 18 36
Category 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 8 0
2021    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 118  
2021 | Category 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0  
2021 | Category 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 118  
2021 | Categories 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0  
2021 | Category 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0  
2020    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 57 46
2020 | Category 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2020 | Category 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 57 46
2020 | Categories 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2020 | Category 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2019    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 88 96
2019 | Category 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2019 | Category 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 88 96
2019 | Categories 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2019 | Category 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2018    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 76 94
2018 | Category 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2018 | Category 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 73 91
2018 | Categories 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 3 3
2018 | Category 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2017    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 98 150
2017 | Category 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 23 22
2017 | Category 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 71 124
2017 | Categories 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 4 4
2017 | Category 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
Prior    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 539 661
Prior | Category 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 30 37
Prior | Category 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 490 595
Prior | Categories 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 11 29
Prior | Category 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans $ 8 $ 0