General - Schedule of impact of adoption for DAC (Details) $ in Millions	Dec. 31, 2020 USD ($)
Balances of and changes in DAC
Impact of adoption for DAC	$ 472
As reported
Balances of and changes in DAC
Impact of adoption for DAC	470
Revision of Prior Period, Adjustment
Balances of and changes in DAC
Impact of adoption for DAC	2
Accident and health
Balances of and changes in DAC
Impact of adoption for DAC	343
Accident and health | As reported
Balances of and changes in DAC
Impact of adoption for DAC	343
Accident and health | Revision of Prior Period, Adjustment
Balances of and changes in DAC
Impact of adoption for DAC	0
Traditional life
Balances of and changes in DAC
Impact of adoption for DAC	32
Traditional life | As reported
Balances of and changes in DAC
Impact of adoption for DAC	32
Traditional life | Revision of Prior Period, Adjustment
Balances of and changes in DAC
Impact of adoption for DAC	0
Interest- sensitive life
Balances of and changes in DAC
Impact of adoption for DAC	97
Interest- sensitive life | As reported
Balances of and changes in DAC
Impact of adoption for DAC	95
Interest- sensitive life | Revision of Prior Period, Adjustment
Balances of and changes in DAC
Impact of adoption for DAC	$ 2