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Investments - Changes in Allowance for Expected Credit Losses on Mortgage Loans (Details) - USD ($)
$ in Millions
 3 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance $ 34 $ 27   $ 39
Provision for loan losses (1) 8 $ 28 (6)
For initial credit losses on purchased loans accounted for as PCD financial assets 0   7  
Ending Balance 33 35 35 33
Residential Mortgage        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 28 26   37
Provision for loan losses (1) 7 26 (10)
For initial credit losses on purchased loans accounted for as PCD financial assets 0   7  
Ending Balance 27 33 33 27
Commercial Mortgage        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 6 1   2
Provision for loan losses 0 1 2 4
For initial credit losses on purchased loans accounted for as PCD financial assets   0 0  
Ending Balance $ 6 $ 2 $ 2 $ 6