Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	$ 10,193	$ 8,812
Fixed maturities, available for sale, allowance for expected credit losses	9	12	$ 0
Available for sale (AFS) fixed maturities	10,357	9,084
Total fixed maturities
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	10,193	8,812
Fixed maturities, available for sale, allowance for expected credit losses	9	12
Gross unrealized gains on available for sale fixed maturities	201	305
Gross unrealized losses on available for sale fixed maturities	(28)	(21)
Available for sale (AFS) fixed maturities	10,357	9,084
Total fixed maturities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		31,596
Fixed maturities, available for sale, allowance for expected credit losses		28
Gross unrealized gains on available for sale fixed maturities		2,652
Gross unrealized losses on available for sale fixed maturities		(97)
Available for sale (AFS) fixed maturities		34,123
Total fixed maturities | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	173	284
Total fixed maturities | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		2,555
U.S. Government and government agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	216	192
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Gross unrealized gains on available for sale fixed maturities	2	6
Gross unrealized losses on available for sale fixed maturities	(2)	0
Available for sale (AFS) fixed maturities	216	198
U.S. Government and government agencies | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		39
Fixed maturities, available for sale, allowance for expected credit losses		0
Gross unrealized gains on available for sale fixed maturities		5
Gross unrealized losses on available for sale fixed maturities		0
Available for sale (AFS) fixed maturities		44
U.S. Government and government agencies | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	0	6
U.S. Government and government agencies | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		5
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	1,758	2,196
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Gross unrealized gains on available for sale fixed maturities	74	116
Gross unrealized losses on available for sale fixed maturities	0	0
Available for sale (AFS) fixed maturities	1,832	2,312
States, municipalities and political subdivisions | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		3,053
Fixed maturities, available for sale, allowance for expected credit losses		0
Gross unrealized gains on available for sale fixed maturities		370
Gross unrealized losses on available for sale fixed maturities		(2)
Available for sale (AFS) fixed maturities		3,421
States, municipalities and political subdivisions | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	74	116
States, municipalities and political subdivisions | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		368
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	248	172
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Gross unrealized gains on available for sale fixed maturities	0	4
Gross unrealized losses on available for sale fixed maturities	(2)	0
Available for sale (AFS) fixed maturities	246	176
Foreign government | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		31
Fixed maturities, available for sale, allowance for expected credit losses		0
Gross unrealized gains on available for sale fixed maturities		4
Gross unrealized losses on available for sale fixed maturities		0
Available for sale (AFS) fixed maturities		35
Foreign government | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	(2)	4
Foreign government | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		4
Residential MBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	915	859
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Gross unrealized gains on available for sale fixed maturities	48	57
Gross unrealized losses on available for sale fixed maturities	(3)	(1)
Available for sale (AFS) fixed maturities	960	915
Residential MBS | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		1,953
Fixed maturities, available for sale, allowance for expected credit losses		3
Gross unrealized gains on available for sale fixed maturities		194
Gross unrealized losses on available for sale fixed maturities		(4)
Available for sale (AFS) fixed maturities		2,140
Residential MBS | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	45	56
Residential MBS | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		190
Commercial MBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	102	89
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Gross unrealized gains on available for sale fixed maturities	2	3
Gross unrealized losses on available for sale fixed maturities	0	0
Available for sale (AFS) fixed maturities	104	92
Commercial MBS | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		659
Fixed maturities, available for sale, allowance for expected credit losses		0
Gross unrealized gains on available for sale fixed maturities		40
Gross unrealized losses on available for sale fixed maturities		(1)
Available for sale (AFS) fixed maturities		698
Commercial MBS | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	2	3
Commercial MBS | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		39
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	1,643	1,065
Fixed maturities, available for sale, allowance for expected credit losses	1	3
Gross unrealized gains on available for sale fixed maturities	3	4
Gross unrealized losses on available for sale fixed maturities	(2)	(4)
Available for sale (AFS) fixed maturities	1,643	1,062
Collateralized loan obligations | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		3,491
Fixed maturities, available for sale, allowance for expected credit losses		10
Gross unrealized gains on available for sale fixed maturities		23
Gross unrealized losses on available for sale fixed maturities		(13)
Available for sale (AFS) fixed maturities		3,491
Collateralized loan obligations | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	1	0
Collateralized loan obligations | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		10
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	2,677	2,040
Fixed maturities, available for sale, allowance for expected credit losses	7	7
Gross unrealized gains on available for sale fixed maturities	17	27
Gross unrealized losses on available for sale fixed maturities	(11)	(13)
Available for sale (AFS) fixed maturities	2,676	2,047
Other asset-backed securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		5,098
Fixed maturities, available for sale, allowance for expected credit losses		11
Gross unrealized gains on available for sale fixed maturities		142
Gross unrealized losses on available for sale fixed maturities		(53)
Available for sale (AFS) fixed maturities		5,176
Other asset-backed securities | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	6	14
Other asset-backed securities | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		89
Corporate and other
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	2,634	2,199
Fixed maturities, available for sale, allowance for expected credit losses	1	2	$ 0
Gross unrealized gains on available for sale fixed maturities	55	88
Gross unrealized losses on available for sale fixed maturities	(8)	(3)
Available for sale (AFS) fixed maturities	2,680	2,282
Corporate and other | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost		17,272
Fixed maturities, available for sale, allowance for expected credit losses		4
Gross unrealized gains on available for sale fixed maturities		1,874
Gross unrealized losses on available for sale fixed maturities		(24)
Available for sale (AFS) fixed maturities		19,118
Corporate and other | Debt Securities
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities	$ 47	85
Corporate and other | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries
Debt Securities, Available-for-sale [Line Items]
Net unrealized gain (loss) on available for sale fixed maturities		$ 1,850