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Investments (Other Invested Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Other Invested Assets [Line Items]    
Other invested assets [1] $ 18,863 $ 18,125
LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets 13,854 12,883
Real estate held through direct ownership    
Other Invested Assets [Line Items]    
Other invested assets 1,877 2,027
Derivative instruments    
Other Invested Assets [Line Items]    
Other invested assets 1,869 1,915
Other    
Other Invested Assets [Line Items]    
Other invested assets 1,263 1,300
Mortgage Debt | Real estate-related    
Other Invested Assets [Line Items]    
Other invested assets 354 409
Equity method | LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets 9,475 8,747
Equity method | Private equity | LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets 4,735 4,311
Equity method | Hedge funds | LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets 2,732 2,451
Equity method | Real estate-related | LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets 2,008 1,985
Fair Value    
Other Invested Assets [Line Items]    
Other invested assets 120 153
Fair Value | LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets 4,379 4,136
Fair Value | Private equity | LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets 1,861 1,786
Fair Value | Hedge funds | LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets 2,199 2,036
Fair Value | Real estate-related | LPs/LLCs    
Other Invested Assets [Line Items]    
Other invested assets $ 319 $ 314
[1] See Note 4 for details of balances associated with variable interest entities.