Future Policy Benefits (Reconciliation of Disclosure to Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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