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Investments - Impairment and credit losses on fixed income securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments [Abstract]      
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date $ 92 $ 101  
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (40) (44)  
Credit Losses on Fixed Income Securities      
Beginning balance (123) (138) $ (176)
Additional credit loss for securities previously other-than-temporarily impaired (4) (7) (9)
Additional credit loss for securities not previously other-than-temporarily impaired (1) (1) (8)
Reduction in credit loss for securities disposed or collected 25 22 54
Change in credit loss due to accretion of increase in cash flows 0 1 1
Ending balance (103) (123) $ (138)
Municipal      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (6) (4)  
Corporate      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings 0 (1)  
ABS      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings (4) (5)  
MBS      
Other-than-temporary impairment losses included in accumulated other comprehensive income      
Amount of other-than-temporary impairment losses included in accumulated other comprehensive income for fixed income securities, not included in earnings $ (30) $ (34)