Fair Value Measurements - Assets and liabilities measured and carried at fair value in the financial statements (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets:
Available for sale (AFS) fixed maturities	$ 10,427	$ 9,084
Trading fixed maturities	29	24
Equity securities	993	889
Assets of managed investment entities	29,942	73,710
Total assets accounted for at fair value	16,579	14,968
Liabilities:
Liabilities of managed investment entities	24,702	66,921
Total liabilities accounted for at fair value	5,034	4,914
Variable interest entity, primary beneficiary
Assets:
Assets of managed investment entities	5,130	4,971
Liabilities:
Liabilities of managed investment entities	5,034	4,914
Fixed maturities
Assets:
Available for sale (AFS) fixed maturities	10,427	9,084
Trading fixed maturities	29	24
U.S. Government and government agencies
Assets:
Available for sale (AFS) fixed maturities	218	198
States, municipalities and political subdivisions
Assets:
Available for sale (AFS) fixed maturities	1,926	2,312
Foreign government
Assets:
Available for sale (AFS) fixed maturities	217	176
Residential MBS
Assets:
Available for sale (AFS) fixed maturities	754	915
Commercial MBS
Assets:
Available for sale (AFS) fixed maturities	113	92
Collateralized loan obligations
Assets:
Available for sale (AFS) fixed maturities	1,829	1,062
Other asset-backed securities
Assets:
Available for sale (AFS) fixed maturities	2,644	2,047
Corporate and other
Assets:
Available for sale (AFS) fixed maturities	2,726	2,282
Equity securities
Assets:
Equity securities	993	889
Level 1
Assets:
Total assets accounted for at fair value	1,229	1,081
Liabilities:
Total liabilities accounted for at fair value	310	215
Level 1 \| Variable interest entity, primary beneficiary
Assets:
Assets of managed investment entities	316	217
Liabilities:
Liabilities of managed investment entities	310	215
Level 1 \| Fixed maturities
Assets:
Available for sale (AFS) fixed maturities	232	199
Trading fixed maturities	0	0
Level 1 \| U.S. Government and government agencies
Assets:
Available for sale (AFS) fixed maturities	217	195
Level 1 \| States, municipalities and political subdivisions
Assets:
Available for sale (AFS) fixed maturities	0	0
Level 1 \| Foreign government
Assets:
Available for sale (AFS) fixed maturities	0	0
Level 1 \| Residential MBS
Assets:
Available for sale (AFS) fixed maturities	0	0
Level 1 \| Commercial MBS
Assets:
Available for sale (AFS) fixed maturities	0	0
Level 1 \| Collateralized loan obligations
Assets:
Available for sale (AFS) fixed maturities	0	0
Level 1 \| Other asset-backed securities
Assets:
Available for sale (AFS) fixed maturities	0	0
Level 1 \| Corporate and other
Assets:
Available for sale (AFS) fixed maturities	15	4
Level 1 \| Equity securities
Assets:
Equity securities	681	665
Level 2
Assets:
Total assets accounted for at fair value	14,452	13,152
Liabilities:
Total liabilities accounted for at fair value	4,712	4,678
Level 2 \| Variable interest entity, primary beneficiary
Assets:
Assets of managed investment entities	4,802	4,733
Liabilities:
Liabilities of managed investment entities	4,712	4,678
Level 2 \| Fixed maturities
Assets:
Available for sale (AFS) fixed maturities	9,577	8,347
Trading fixed maturities	29	24
Level 2 \| U.S. Government and government agencies
Assets:
Available for sale (AFS) fixed maturities	1	3
Level 2 \| States, municipalities and political subdivisions
Assets:
Available for sale (AFS) fixed maturities	1,884	2,273
Level 2 \| Foreign government
Assets:
Available for sale (AFS) fixed maturities	217	176
Level 2 \| Residential MBS
Assets:
Available for sale (AFS) fixed maturities	736	877
Level 2 \| Commercial MBS
Assets:
Available for sale (AFS) fixed maturities	113	90
Level 2 \| Collateralized loan obligations
Assets:
Available for sale (AFS) fixed maturities	1,828	1,046
Level 2 \| Other asset-backed securities
Assets:
Available for sale (AFS) fixed maturities	2,335	1,742
Level 2 \| Corporate and other
Assets:
Available for sale (AFS) fixed maturities	2,463	2,140
Level 2 \| Equity securities
Assets:
Equity securities	44	48
Level 3
Assets:
Total assets accounted for at fair value	898	735
Liabilities:
Total liabilities accounted for at fair value	12	21
Level 3 \| Variable interest entity, primary beneficiary
Assets:
Assets of managed investment entities	12	21
Liabilities:
Liabilities of managed investment entities	12	21
Level 3 \| Fixed maturities
Assets:
Available for sale (AFS) fixed maturities	618	538
Trading fixed maturities	0	0
Level 3 \| U.S. Government and government agencies
Assets:
Available for sale (AFS) fixed maturities	0	0
Level 3 \| States, municipalities and political subdivisions
Assets:
Available for sale (AFS) fixed maturities	42	39
Level 3 \| Foreign government
Assets:
Available for sale (AFS) fixed maturities	0	0
Level 3 \| Residential MBS
Assets:
Available for sale (AFS) fixed maturities	18	38
Level 3 \| Commercial MBS
Assets:
Available for sale (AFS) fixed maturities	0	2
Level 3 \| Collateralized loan obligations
Assets:
Available for sale (AFS) fixed maturities	1	16
Level 3 \| Other asset-backed securities
Assets:
Available for sale (AFS) fixed maturities	309	305
Level 3 \| Corporate and other
Assets:
Available for sale (AFS) fixed maturities	248	138
Level 3 \| Equity securities
Assets:
Equity securities	$ 268	$ 176

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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