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Variable Interest Entities (Narrative) (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Total liabilities $ 848,504,000,000 $ 872,512,000,000
Fixed maturities, available-for-sale, Fixed maturities, trading, Equity securities and Other invested assets    
Variable Interest Entity [Line Items]    
Maximum exposure to loss on these investments 948,000,000 935,000,000
LPs/LLCs | Other invested assets    
Variable Interest Entity [Line Items]    
Maximum exposure to loss on these investments 13,854,000,000 $ 12,883,000,000
Unconsolidated VIEs    
Variable Interest Entity [Line Items]    
Total liabilities $ 0