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Investments (Concentrations of Credit Risk) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | $ 63,132 | $ 66,537
Concentrations of credit risk at fair value | 62,017 | 66,396
Investments in Brazil government and government agencies securities |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 3,455 | 2,534
Concentrations of credit risk at fair value | 3,419 | 2,281
Assets supporting experience-rated contractholder liabilities | Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 522 | 613
Concentrations of credit risk at fair value | 514 | 587
Short-term Investments | Investments in Brazil government and government agencies securities |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 0 | 60
Concentrations of credit risk at fair value | 0 | 61
Cash equivalents | Investments in Brazil government and government agencies securities |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 427 | 210
Concentrations of credit risk at fair value | 427 | 210
Fixed maturities, available-for-sale | Fixed maturities | Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 62,591 | 65,198
Concentrations of credit risk at fair value | 61,484 | 64,959
Fixed maturities, available-for-sale | Fixed maturities | Investments in Brazil government and government agencies securities |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 3,028 | 2,264
Concentrations of credit risk at fair value | 2,992 | 2,010
Fixed maturities, held-to-maturity | Fixed maturities | Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 0 | 706
Concentrations of credit risk at fair value | 0 | 831
Fixed maturities, Trading | Fixed maturities | Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentrations of credit risk at amortized cost | 19 | 20
Concentrations of credit risk at fair value | $ 19 | $ 19

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