Future Policy Benefits (Short-Duration Contracts Historical Claims) (Details)	Dec. 31, 2023
Group Life - Term
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	76.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	21.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	0.90%
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	0.00%
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	24.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	24.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	14.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	10.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	7.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	3.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	2.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	1.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.90%
Group Long-Term Disability
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	24.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	14.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	8.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	6.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	4.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	3.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	3.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	3.00%
Protection Life | Latin America
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Short-duration Insurance Contracts, Historical Claims Duration, Year One	58.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	31.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	4.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	1.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	(0.10%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	(0.70%)
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	(1.00%)
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	84.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two	13.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three	0.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five	0.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight	0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine	0.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten	0.00%