Future Policy Benefits (Short-Duration Contracts Historical Claims) (Details)	Dec. 31, 2024
Group Life - Term
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	75.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	21.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%
Group Life - Term | Asia
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	25.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	25.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	15.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	11.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	1.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(0.60%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	1.40%
Group Long-Term Disability | Group Benefits
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	5.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	24.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	13.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	9.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	6.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	4.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	4.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	4.00%
Protection Life | Latin America
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	57.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	31.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	4.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	1.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	(0.10%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	(0.10%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	(0.40%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.30%
Protection Health | Latin America
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	84.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	13.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	0.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%