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Investments Investments - Equity Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Other investments $ 401 $ 478
Real Estate [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 15 16
Hedge Funds, Multi-strategy [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 100 65
Interest Rate Contract [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 49 176
Illiquid Investments [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 56 51
Insurance Linked [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 3 3
Equity [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 40 55
Credit Index Product [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 66 66
Private Equity Funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 4 0
Emerging Market Debt [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 17 0
Equity investments in pooled funds [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 350 432
Priced Through Pricing Vendors [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 50 136
Priced Through Pricing Vendors [Member] | Interest Rate Contract [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 3 81
Priced Through Pricing Vendors [Member] | Equity [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 30 55
Priced Through Pricing Vendors [Member] | Emerging Market Debt [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 17 $ 0
Commitments [Member] | Financial Support, Capital Contributions [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments 75  
Commitments [Member] | Partnership Interest [Member]    
Schedule of Equity Method Investments [Line Items]    
Other investments $ 49