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Segments of Operations - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
Jun. 30, 2020
USD ($)
Segment Reporting Information [Line Items]        
Number of segments | segment     2  
Net investment income $ 164 $ 88 $ 352 $ 192
Neon Capital Limited        
Segment Reporting Information [Line Items]        
Net investment income   0   (6)
Neon Capital Limited | Maximum        
Segment Reporting Information [Line Items]        
Net investment income   1    
Continuing operations        
Segment Reporting Information [Line Items]        
Earnings from real-estate related investments, net of DAC 22 2 51 8
Continuing operations | Real estate-related investments        
Segment Reporting Information [Line Items]        
Net investment income 22 7 51 19
Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Net investment income 143 72 302 165
Property and casualty insurance underwriting 152 9 286 96
Investment and other income, net 136 65 290 149
Other lines | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Property and casualty insurance underwriting $ (1) (45) $ (1) (47)
Other lines | Property and Casualty Insurance | Neon Capital Limited        
Segment Reporting Information [Line Items]        
Property and casualty insurance underwriting   (43)   (44)
Investment and other income, net   (1)   (10)
Neon Capital Limited | Other lines | Property and Casualty Insurance        
Segment Reporting Information [Line Items]        
Net investment income       $ (6)
Neon Capital Limited | Other lines | Property and Casualty Insurance | Maximum        
Segment Reporting Information [Line Items]        
Net investment income   $ 1