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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	$ 10,954	$ 10,193
Fixed maturities, available for sale, allowance for expected credit losses	7	9	$ 10	$ 12
Available for sale (AFS) fixed maturities	10,809	10,357
Total fixed maturities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	10,954	10,193
Fixed maturities, available for sale, allowance for expected credit losses	7	9
Fixed maturities, available for sale, gross unrealized, gains	82	201
Fixed maturities, available for sale, gross unrealized, losses	(220)	(28)
Available for sale (AFS) fixed maturities	10,809	10,357
Total fixed maturities \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	(138)	173
U.S. Government and government agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	216	216
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Fixed maturities, available for sale, gross unrealized, gains	1	2
Fixed maturities, available for sale, gross unrealized, losses	(8)	(2)
Available for sale (AFS) fixed maturities	209	216
U.S. Government and government agencies \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	(7)	0
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	1,648	1,758
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Fixed maturities, available for sale, gross unrealized, gains	22	74
Fixed maturities, available for sale, gross unrealized, losses	(13)	0
Available for sale (AFS) fixed maturities	1,657	1,832
States, municipalities and political subdivisions \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	9	74
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	266	248
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Fixed maturities, available for sale, gross unrealized, gains	0	0
Fixed maturities, available for sale, gross unrealized, losses	(9)	(2)
Available for sale (AFS) fixed maturities	257	246
Foreign government \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	(9)	(2)
Residential MBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	1,550	915
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Fixed maturities, available for sale, gross unrealized, gains	36	48
Fixed maturities, available for sale, gross unrealized, losses	(55)	(3)
Available for sale (AFS) fixed maturities	1,531	960
Residential MBS \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	(19)	45
Commercial MBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	100	102
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Fixed maturities, available for sale, gross unrealized, gains	0	2
Fixed maturities, available for sale, gross unrealized, losses	0	0
Available for sale (AFS) fixed maturities	100	104
Commercial MBS \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	0	2
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	1,907	1,643
Fixed maturities, available for sale, allowance for expected credit losses	1	1
Fixed maturities, available for sale, gross unrealized, gains	2	3
Fixed maturities, available for sale, gross unrealized, losses	(14)	(2)
Available for sale (AFS) fixed maturities	1,894	1,643
Collateralized loan obligations \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	(12)	1
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	2,725	2,677
Fixed maturities, available for sale, allowance for expected credit losses	5	7
Fixed maturities, available for sale, gross unrealized, gains	5	17
Fixed maturities, available for sale, gross unrealized, losses	(68)	(11)
Available for sale (AFS) fixed maturities	2,657	2,676
Other asset-backed securities \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	(63)	6
Corporate and other
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available for sale, amortized cost	2,542	2,634
Fixed maturities, available for sale, allowance for expected credit losses	1	1	$ 1	$ 2
Fixed maturities, available for sale, gross unrealized, gains	16	55
Fixed maturities, available for sale, gross unrealized, losses	(53)	(8)
Available for sale (AFS) fixed maturities	2,504	2,680
Corporate and other \| Debt Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax	$ (37)	$ 47