Investments - Scheduled maturities of available for sale fixed maturities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Fiscal Year Maturity [Abstract]
Available for sale (AFS) fixed maturities	$ 9,885	$ 10,095
Fair Value Percent, Fiscal Year Maturity [Abstract]
Average life of ABS	3 years
Average life of MBS	6 years 6 months
Fixed maturities:
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
One year or less	$ 479
After one year through five years	2,551
After five years through ten years	1,075
After ten years	343
Fixed maturities amortized cost, Subtotal	4,448
Amortized Cost	10,472
Fair Value, Fiscal Year Maturity [Abstract]
One year or less	471
After one year through five years	2,414
After five years through ten years	1,024
After ten years	323
Fixed maturities fair value, Subtotal	4,232
Available for sale (AFS) fixed maturities	$ 9,885	$ 10,095
Fair Value Percent, Fiscal Year Maturity [Abstract]
One year or less	5.00%
After one year through five years	24.00%
After five years through ten years	10.00%
After ten years	3.00%
Fixed maturities fair value, Subtotal, Percent	42.00%
Fair value, Total, Percent	100.00%
Collateralized loan obligations and other asset backed securities
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Fixed maturities without single maturity date	$ 4,235
Fair Value, Fiscal Year Maturity [Abstract]
Fixed maturities without single maturity date	$ 4,028
Fair Value Percent, Fiscal Year Maturity [Abstract]
Fixed maturities without single maturity date	41.00%
Mortgage-backed securities
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Fixed maturities without single maturity date	$ 1,789
Fair Value, Fiscal Year Maturity [Abstract]
Fixed maturities without single maturity date	$ 1,625
Fair Value Percent, Fiscal Year Maturity [Abstract]
Fixed maturities without single maturity date	17.00%