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Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details) $ in Millions	Dec. 31, 2022 USD ($)
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	$ 31,807
Total investments and cash, Market Value	29,853
Total investments and cash, Amount Shown in Balance Sheet	29,872
Fixed Maturity Securities [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	24,191
Total investments and cash, Market Value	22,236
Total investments and cash, Amount Shown in Balance Sheet	22,236
Fixed Maturity Securities [Member] | Held-to-Maturity [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	848
Total investments and cash, Market Value	821
Total investments and cash, Amount Shown in Balance Sheet	839
U.S. Government and Government Agencies [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	1,334
Total investments and cash, Market Value	1,257
Total investments and cash, Amount Shown in Balance Sheet	1,257
State, Municipalities and Political Subdivisions [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	444
Total investments and cash, Market Value	413
Total investments and cash, Amount Shown in Balance Sheet	413
Foreign Government Securities [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	1,586
Total investments and cash, Market Value	1,415
Total investments and cash, Amount Shown in Balance Sheet	1,415
Foreign Corporate Securities [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	5,143
Total investments and cash, Market Value	4,596
Total investments and cash, Amount Shown in Balance Sheet	4,596
Foreign Corporate Securities [Member] | Held-to-Maturity [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	28
Total investments and cash, Market Value	28
Total investments and cash, Amount Shown in Balance Sheet	27
Public Utilities [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	218
Total investments and cash, Market Value	203
Total investments and cash, Amount Shown in Balance Sheet	203
All Other Corporate Bonds [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	10,688
Total investments and cash, Market Value	10,013
Total investments and cash, Amount Shown in Balance Sheet	10,013
All Other Corporate Bonds [Member] | Held-to-Maturity [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	813
Total investments and cash, Market Value	786
Total investments and cash, Amount Shown in Balance Sheet	806
Mortgage-Backed Securities: Commercial [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	1,023
Total investments and cash, Market Value	919
Total investments and cash, Amount Shown in Balance Sheet	919
Mortgage-Backed Securities: Commercial [Member] | Held-to-Maturity [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	7
Total investments and cash, Market Value	7
Total investments and cash, Amount Shown in Balance Sheet	7
Mortgage Backed Securities: Agency residential [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	3,382
Total investments and cash, Market Value	3,099
Total investments and cash, Amount Shown in Balance Sheet	3,099
Mortgage Backed Securities: Non-agency residential [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	5
Total investments and cash, Market Value	4
Total investments and cash, Amount Shown in Balance Sheet	4
Redeemable Preferred Stock [Member] | Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	368
Total investments and cash, Market Value	316
Total investments and cash, Amount Shown in Balance Sheet	316
Equity Securities [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	252
Total investments and cash, Market Value	281
Total investments and cash, Amount Shown in Balance Sheet	281
Short Term Investments [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	1,032
Total investments and cash, Market Value	1,032
Total investments and cash, Amount Shown in Balance Sheet	1,032
Other Invested Assets [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	4,085
Total investments and cash, Market Value	4,085
Total investments and cash, Amount Shown in Balance Sheet	4,085
Cash [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	1,398
Total investments and cash, Market Value	1,398
Total investments and cash, Amount Shown in Balance Sheet	$ 1,398

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Amount of investment held by insurance company, excluding investment in related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
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Cost of investment held by insurance company, excluding investment in related party.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column B))
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-SubTopic 320
-Section S99
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