Investments - Scheduled maturities of available for sale fixed maturities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Fiscal Year Maturity [Abstract]
Fair Value	$ 10,034	$ 10,357
Fair Value Percent, Fiscal Year Maturity [Abstract]
Average life of ABS	3 years 6 months
Average life of MBS	5 years 6 months
Fixed maturities
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
One year or less	$ 578
After one year through five years	2,693
After five years through ten years	1,018
After ten years	280
Fixed maturities amortized cost, Subtotal	4,569
Collateralized loan obligations and other ABS (average life of approximately 3.5 years)	4,320
MBS (average life of approximately 5.5 years)	1,846
Amortized Cost	10,735
Fair Value, Fiscal Year Maturity [Abstract]
One year or less	575
After one year through five years	2,511
After five years through ten years	932
After ten years	250
Fixed maturities fair value, Subtotal	4,268
Collateralized loan obligations and other ABS (average life of approximately 3.5 years)	4,077
MBS (average life of approximately 5.5 years)	1,689
Fair Value	$ 10,034	$ 10,357
Fair Value Percent, Fiscal Year Maturity [Abstract]
One year or less	6.00%
After one year through five years	25.00%
After five years through ten years	9.00%
After ten years	2.00%
Fixed maturities fair value, Subtotal, Percent	42.00%
Collateralized loan obligations and other ABS (average life of approximately 3.5 years)	41.00%
MBS (average life of approximately 5.5 years)	17.00%
Fair value, Total, Percent	100.00%