Schedule I — Summary of Investments Other than Investments in Related Parties (Details) $ in Millions	Dec. 31, 2024 USD ($)
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	$ 73,347
Amount shown in the Balance Sheet	72,610
Total fixed maturities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	53,616
Fair value (if applicable)	52,747
Amount shown in the Balance Sheet	52,747
United States government, government agencies and authorities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	11,423
Fair value (if applicable)	11,108
Amount shown in the Balance Sheet	11,108
States, municipalities and political subdivisions
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	8,985
Fair value (if applicable)	8,842
Amount shown in the Balance Sheet	8,842
Foreign governments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	1,352
Fair value (if applicable)	1,364
Amount shown in the Balance Sheet	1,364
Public utilities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	5,125
Fair value (if applicable)	5,092
Amount shown in the Balance Sheet	5,092
All other corporate bonds
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	25,505
Fair value (if applicable)	25,100
Amount shown in the Balance Sheet	25,100
Asset-backed securities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	1,226
Fair value (if applicable)	1,241
Amount shown in the Balance Sheet	1,241
Total equity securities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	4,329
Fair value (if applicable)	4,463
Amount shown in the Balance Sheet	4,463
Public utilities
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	82
Fair value (if applicable)	82
Amount shown in the Balance Sheet	82
Banks, trusts and insurance companies
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	243
Fair value (if applicable)	245
Amount shown in the Balance Sheet	245
Industrial, miscellaneous and all other
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	3,684
Fair value (if applicable)	3,745
Amount shown in the Balance Sheet	3,745
Nonredeemable preferred stocks
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	320
Fair value (if applicable)	391
Amount shown in the Balance Sheet	391
Mortgage loans on real estate
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	784
Fair value (if applicable)	746
Amount shown in the Balance Sheet	784
Real estate (none acquired in satisfaction of debt)
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	620
Amount shown in the Balance Sheet	620
Derivative instruments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	2
Fair value (if applicable)	2
Amount shown in the Balance Sheet	2
Limited partnership interests
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	9,255
Amount shown in the Balance Sheet	9,255
Other long-term investments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	202
Fair value (if applicable)	208
Amount shown in the Balance Sheet	202
Short-term investments
Summary of Investments Other Than Investments in Related Parties
Cost/amortized cost, net	4,539
Fair value (if applicable)	4,537
Amount shown in the Balance Sheet	$ 4,537