Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	$ 112,034	$ 111,707
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	97,804	$ 99,736
Fixed maturity AFS securities other than structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Due in one year or less	3,961
Due after one year through five years	18,847
Due after five years through ten years	16,862
Due after ten years	55,008
Amortized Cost	94,678
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	3,917
Due after one year through five years	17,848
Due after five years through ten years	14,929
Due after ten years	45,088
Fair Value	81,782
Structured securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized Cost	17,356
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	$ 16,022

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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