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Investments (excluding Consolidated Investment Entities) - Mortgage Loans (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum loan to value ratio generally allowed 75.00%    
Commercial mortgage loans $ 6,879,000,000 $ 7,283,000,000  
Collective valuation allowance for losses (1,000,000) (2,000,000)  
Total net commercial mortgage loans 6,878,000,000 7,281,000,000  
Impairments on mortgage loan portfolio 2 0  
Impairment 60,000,000 28,000,000 $ 20,000,000
Impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial mortgage loans 4,000,000 4,000,000  
Total net commercial mortgage loans 4,000,000 4,000,000  
Non Impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial mortgage loans 6,875,000,000 7,279,000,000  
Collective valuation allowance for losses (1,000,000) (2,000,000)  
Total net commercial mortgage loans 6,874,000,000 $ 7,277,000,000  
Mortgage loans on real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impairment $ 4,000,000