Schedule I - Summary of Investments Other than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2021 USD ($)
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	$ 62,896
Amount shown in the Balance Sheet	64,701
United States government, government agencies and authorities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	6,287
Fair value (if applicable)	6,273
Amount shown in the Balance Sheet	6,273
States, municipalities and political subdivisions
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	6,130
Fair value (if applicable)	6,393
Amount shown in the Balance Sheet	6,393
Foreign governments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	982
Fair value (if applicable)	985
Amount shown in the Balance Sheet	985
Public utilities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	2,009
Fair value (if applicable)	2,024
Amount shown in the Balance Sheet	2,024
All other corporate bonds
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	24,825
Fair value (if applicable)	25,306
Amount shown in the Balance Sheet	25,306
Asset-backed securities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	1,143
Fair value (if applicable)	1,155
Amount shown in the Balance Sheet	1,155
Total fixed maturities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	41,376
Fair value (if applicable)	42,136
Amount shown in the Balance Sheet	42,136
Public utilities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	99
Fair value (if applicable)	118
Amount shown in the Balance Sheet	118
Banks, trusts and insurance companies
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	548
Fair value (if applicable)	653
Amount shown in the Balance Sheet	653
Industrial, miscellaneous and all other
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	5,145
Fair value (if applicable)	5,954
Amount shown in the Balance Sheet	5,954
Nonredeemable preferred stocks
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	224
Fair value (if applicable)	336
Amount shown in the Balance Sheet	336
Total equity securities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	6,016
Fair value (if applicable)	7,061
Amount shown in the Balance Sheet	7,061
Mortgage loans on real estate
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	821
Fair value (if applicable)	853
Amount shown in the Balance Sheet	821
Real estate (none acquired in satisfaction of debt)
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	809
Amount shown in the Balance Sheet	809
Policy loans
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	148
Amount shown in the Balance Sheet	148
Derivative instruments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	12
Fair value (if applicable)	12
Amount shown in the Balance Sheet	12
Limited partnership interests
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	8,018
Amount shown in the Balance Sheet	8,018
Other long-term investments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	1,687
Amount shown in the Balance Sheet	1,687
Short-term investments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	4,009
Fair value (if applicable)	4,009
Amount shown in the Balance Sheet	$ 4,009