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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, Amortized Cost | $ 703 | $ 536
Due after one year through five years, Amortized Cost | 4,320 | 3,288
Due after five years through ten years, Amortized Cost | 3,195 | 2,171
Due after ten years, Amortized Cost | 15,453 | 14,503
Subtotal, Amortized Cost | 23,671 | 20,498
Other securities which provide for periodic payments, Amortized Cost | 21,935 | 17,210
Due in one year or less, Fair Value | 687 | 527
Due after one year through five years, Fair Value | 4,209 | 3,089
Due after five years through ten years, Fair Value | 3,048 | 1,939
Due after ten years, Fair Value | 13,183 | 11,457
Subtotal, Fair Value | 21,127 | 17,012
Other securities which provide for periodic payments, Fair Value | 21,246 | 16,083
Amortized Cost | 45,606 | 37,708
Fair Value | 42,373 | 33,095
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 14,631 | 12,209
Other securities which provide for periodic payments, Fair Value | 14,342 | 11,467
Amortized Cost | 14,631 | 12,209
Fair Value | 14,342 | 11,467
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 4,797 | 3,337
Other securities which provide for periodic payments, Fair Value | 4,475 | 3,063
Amortized Cost | 4,797 | 3,337
Fair Value | 4,475 | 3,063
Structured hybrids |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost |  | 26
Other securities which provide for periodic payments, Fair Value |  | 26
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities which provide for periodic payments, Amortized Cost | 2,507 | 1,638
Other securities which provide for periodic payments, Fair Value | $ 2,429 | $ 1,527

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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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