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Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Cost or Amortized Cost |  |
Cost or Amortized Cost | $ 42,037 | $ 41,102
Estimated Fair Value |  |
Estimated Fair Value | 38,926 | 37,697
Available-for-sale Fixed Maturities |  |
Cost or Amortized Cost |  |
Due in one year or less | 988 | 1,012
Due after one year through five years | 11,072 | 9,880
Due after five years through ten years | 13,445 | 13,788
Due after ten years | 16,333 | 16,352
Cost or Amortized Cost | 41,838 | 41,032
Estimated Fair Value |  |
Due in one year or less | 972 | 1,001
Due after one year through five years | 10,443 | 9,399
Due after five years through ten years | 12,226 | 12,453
Due after ten years | 15,087 | 14,774
Estimated Fair Value | $ 38,728 | $ 37,627

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