Future Policy Benefits (Reconciliation of Disclosure to Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	$ 14,468
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	1,078
Total unpaid claims and allocated claims adjustment expense	15,546
Unallocated claims adjustment expenses	0
Discounting	(1,488)
Liability for unpaid claims and claim adjustment liabilities - short-duration	14,058
Liability for unpaid claims and claim adjustment liabilities - long-duration	2,410
Liability for Claims and Claims Adjustment Expense	16,468	$ 16,098	$ 15,598	$ 14,698
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	10,944
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	280
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	642
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	38
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	3,187
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	8
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	1,011
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	475
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	7,757
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	272
Discounting	(1,300)	$ (1,200)
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	446
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	14
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	196
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	24
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	1,871
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	$ 285