Schedule I — Summary of Investments Other than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2023 USD ($)
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	$ 67,295
Amount shown in the Balance Sheet	66,677
Total fixed maturities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	49,649
Fair value (if applicable)	48,865
Amount shown in the Balance Sheet	48,865
United States government, government agencies and authorities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	8,624
Fair value (if applicable)	8,619
Amount shown in the Balance Sheet	8,619
States, municipalities and political subdivisions
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	6,049
Fair value (if applicable)	6,006
Amount shown in the Balance Sheet	6,006
Foreign governments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	1,286
Fair value (if applicable)	1,290
Amount shown in the Balance Sheet	1,290
Public utilities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	5,330
Fair value (if applicable)	5,316
Amount shown in the Balance Sheet	5,316
All other corporate bonds
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	26,621
Fair value (if applicable)	25,889
Amount shown in the Balance Sheet	25,889
Asset-backed securities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	1,739
Fair value (if applicable)	1,745
Amount shown in the Balance Sheet	1,745
Total equity securities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	2,244
Fair value (if applicable)	2,411
Amount shown in the Balance Sheet	2,411
Public utilities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	44
Fair value (if applicable)	47
Amount shown in the Balance Sheet	47
Banks, trusts and insurance companies
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	36
Fair value (if applicable)	53
Amount shown in the Balance Sheet	53
Industrial, miscellaneous and all other
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	1,855
Fair value (if applicable)	1,956
Amount shown in the Balance Sheet	1,956
Nonredeemable preferred stocks
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	309
Fair value (if applicable)	355
Amount shown in the Balance Sheet	355
Mortgage loans on real estate
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	822
Fair value (if applicable)	769
Amount shown in the Balance Sheet	822
Real estate (none acquired in satisfaction of debt)
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	709
Amount shown in the Balance Sheet	709
Policy loans
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	119
Amount shown in the Balance Sheet	119
Derivative instruments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	1
Fair value (if applicable)	1
Amount shown in the Balance Sheet	1
Limited partnership interests
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	8,380
Amount shown in the Balance Sheet	8,380
Other long-term investments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	226
Fair value (if applicable)	239
Amount shown in the Balance Sheet	226
Short-term investments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	5,145
Fair value (if applicable)	5,144
Amount shown in the Balance Sheet	$ 5,144