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Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Cost or Amortized Cost |  |
Cost or Amortized Cost | $ 44,028 | $ 42,615
Estimated Fair Value |  |
Estimated Fair Value | 43,055 | 40,626
Available-for-sale Fixed Maturities |  |
Cost or Amortized Cost |  |
Due in one year or less | 1,585 | 1,121
Due after one year through five years | 11,948 | 11,563
Due after five years through ten years | 13,282 | 13,359
Due after ten years | 16,685 | 16,371
Cost or Amortized Cost | 43,500 | 42,414
Estimated Fair Value |  |
Due in one year or less | 1,565 | 1,091
Due after one year through five years | 11,800 | 11,180
Due after five years through ten years | 12,907 | 12,573
Due after ten years | 16,255 | 15,581
Estimated Fair Value | $ 42,527 | $ 40,425

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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