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Future Policy Benefits (Liabilities for Unpaid Claims - Methodology) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Short-duration Insurance Contract, Discounted Liability, Discount | $ 1,672 |  |
Group Benefits |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Short-Duration Insurance Contract, Discounted Liability, Interest Accretion, Statement of Financial Position [Extensible Enumeration] | Policyholder benefits and claims | Policyholder benefits and claims | Policyholder benefits and claims
Group Long-Term Disability | Group Benefits |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Short-Duration Contracts, Discounted Liabilities, Amount | $ 6,800 | $ 6,700 |
Short-duration Insurance Contract, Discounted Liability, Discount | 1,500 | 1,300 |
Short-duration Insurance Contracts, Discounted Liabilities, Interest Accretion | $ 464 | 516 | $ 461
Group Long-Term Disability | Minimum | Group Benefits |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Short-Duration Contract, Discounted Liability, Discount Rate | 3.00% |  |
Group Long-Term Disability | Maximum | Group Benefits |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Short-Duration Contract, Discounted Liability, Discount Rate | 8.00% |  |
Group Life - Term | Asia |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Short-Duration Contracts, Discounted Liabilities, Amount | $ 1,200 | 1,300 |
Short-duration Insurance Contract, Discounted Liability, Discount | 166 | 163 |
Short-duration Insurance Contracts, Discounted Liabilities, Interest Accretion | $ 44 | $ 37 | $ 22
Group Life - Term | Minimum | Asia |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Short-Duration Contract, Discounted Liability, Discount Rate | 1.00% |  |
Group Life - Term | Maximum | Asia |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Short-Duration Contract, Discounted Liability, Discount Rate | 7.00% |  |

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