Fair Value Measurements - Assets and liabilities measured and carried at fair value in the financial statements (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets:
Available for sale (AFS) fixed maturities	$ 9,732	$ 9,084
Trading fixed maturities	26	24
Equity securities	965	889
Assets of managed investment entities	28,780	73,710
Total assets of continuing operations accounted for at fair value	15,809	14,968
Liabilities:
Liabilities of managed investment entities	23,179	66,921
Total liabilities of continuing operations accounted for at fair value	5,029	4,914
Variable interest entity, primary beneficiary
Assets:
Assets of managed investment entities	5,086	4,971
Liabilities:
Liabilities of managed investment entities	5,029	4,914
Fixed maturities
Assets:
Available for sale (AFS) fixed maturities	9,732	9,084
Trading fixed maturities	26	24
U.S. Government and government agencies
Assets:
Available for sale (AFS) fixed maturities	221	198
States, municipalities and political subdivisions
Assets:
Available for sale (AFS) fixed maturities	2,060	2,312
Foreign government
Assets:
Available for sale (AFS) fixed maturities	208	176
Residential MBS
Assets:
Available for sale (AFS) fixed maturities	798	915
Commercial MBS
Assets:
Available for sale (AFS) fixed maturities	130	92
Collateralized loan obligations
Assets:
Available for sale (AFS) fixed maturities	1,384	1,062
Other asset-backed securities
Assets:
Available for sale (AFS) fixed maturities	2,359	2,047
Corporate and other
Assets:
Available for sale (AFS) fixed maturities	2,572	2,282
Equity securities
Assets:
Equity securities	965	889
Level 1
Assets:
Total assets of continuing operations accounted for at fair value	1,163	1,081
Liabilities:
Total liabilities of continuing operations accounted for at fair value	266	215
Level 1 \| Variable interest entity, primary beneficiary
Assets:
Assets of managed investment entities	269	217
Liabilities:
Liabilities of managed investment entities	266	215
Level 1 \| Fixed maturities
Assets:
Available for sale (AFS) fixed maturities	222	199
Trading fixed maturities	0	0
Level 1 \| U.S. Government and government agencies
Assets:
Available for sale (AFS) fixed maturities	218	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	4	4
Level 1 \| Equity securities
Assets:
Equity securities	672	665
Level 2
Assets:
Total assets of continuing operations accounted for at fair value	13,781	13,152
Liabilities:
Total liabilities of continuing operations accounted for at fair value	4,749	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	4,749	4,678
Level 2 \| Fixed maturities
Assets:
Available for sale (AFS) fixed maturities	8,905	8,347
Trading fixed maturities	26	24
Level 2 \| U.S. Government and government agencies
Assets:
Available for sale (AFS) fixed maturities	3	3
Level 2 \| States, municipalities and political subdivisions
Assets:
Available for sale (AFS) fixed maturities	2,024	2,273
Level 2 \| Foreign government
Assets:
Available for sale (AFS) fixed maturities	208	176
Level 2 \| Residential MBS
Assets:
Available for sale (AFS) fixed maturities	770	877
Level 2 \| Commercial MBS
Assets:
Available for sale (AFS) fixed maturities	130	90
Level 2 \| Collateralized loan obligations
Assets:
Available for sale (AFS) fixed maturities	1,378	1,046
Level 2 \| Other asset-backed securities
Assets:
Available for sale (AFS) fixed maturities	2,044	1,742
Level 2 \| Corporate and other
Assets:
Available for sale (AFS) fixed maturities	2,348	2,140
Level 2 \| Equity securities
Assets:
Equity securities	48	48
Level 3
Assets:
Total assets of continuing operations accounted for at fair value	865	735
Liabilities:
Total liabilities of continuing operations accounted for at fair value	14	21
Level 3 \| Variable interest entity, primary beneficiary
Assets:
Assets of managed investment entities	15	21
Liabilities:
Liabilities of managed investment entities	14	21
Level 3 \| Fixed maturities
Assets:
Available for sale (AFS) fixed maturities	605	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	36	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	28	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	6	16
Level 3 \| Other asset-backed securities
Assets:
Available for sale (AFS) fixed maturities	315	305
Level 3 \| Corporate and other
Assets:
Available for sale (AFS) fixed maturities	220	138
Level 3 \| Equity securities
Assets:
Equity securities	$ 245	$ 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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