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Investments - Impairment and credit losses on fixed income securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments [Abstract]      
Net unrealized gains related to changes in valuation of fixed income securities subsequent to impairment measurement date $ 101 $ 113  
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 (44) (53)  
Credit Losses on Fixed Income Securities      
Beginning balance (138) (176) $ (200)
Additional credit loss for securities previously other-than-temporarily impaired (7) (9) (16)
Additional credit loss for securities not previously other-than-temporarily impaired (1) (8) (19)
Reduction in credit loss for securities disposed or collected 22 54 58
Change in credit loss due to accretion of increase in cash flows 1 1 1
Ending balance (123) (138) $ (176)
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 (4) (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 (1) 0  
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 (5) (8)  
RMBS      
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 (32) (37)  
CMBS      
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 $ (2) $ (4)