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Future Policy Benefits (Reconciliation of Disclosure to Liability) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | $ 14,416 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 1,039 |  |  |
Total unpaid claims and allocated claims adjustment expense | 15,455 |  |  |
Unallocated claims adjustment expenses | 0 |  |  |
Discounting | (1,672) |  |  |
Liability for unpaid claims and claim adjustment liabilities - short-duration | 13,783 |  |  |
Liability for unpaid claims and claim adjustment liabilities - long-duration | 2,335 |  |  |
Liability for Claims and Claims Adjustment Expense | 16,118 | $ 16,468 | $ 16,098 | $ 15,598
Liability for Future Policy Benefit, before Reinsurance |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Liability for Claims and Claims Adjustment Expense | 7,900 |  |  |
Other Policy-Related Balances |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Liability for Claims and Claims Adjustment Expense | 8,200 |  |  |
UNITED STATES |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 11,208 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 307 |  |  |
Latin America |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 573 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 28 |  |  |
Group Life - Term |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 3,159 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 10 |  |  |
Group Life - Term | Asia |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 938 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 428 |  |  |
Group Long-Term Disability |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 8,049 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 297 |  |  |
Protection Life |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 386 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 11 |  |  |
Protection Health |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 187 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 17 |  |  |
Other insurance lines - all segments combined |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 1,697 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | $ 276 |  |  |

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