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Insurance (Short-Duration Contracts Historical Claims) (Details)
Dec. 31, 2020
Group Life - Term  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 78.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.00%
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 0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 0.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.00%
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 24.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 26.10%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 13.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 10.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 8.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 7.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 2.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 3.30%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.80%
Group Long-Term Disability  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 4.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 20.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 14.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 8.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 7.20%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 6.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 5.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 4.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 3.70%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 3.60%
Protection Life | Latin America  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 58.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 30.80%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 3.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 1.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five 0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Six 0.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Seven 0.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Eight 0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.50%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%
Protection Health | Latin America  
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
Short-duration Insurance Contracts, Historical Claims Duration, Year One 84.90%
Short-duration Insurance Contracts, Historical Claims Duration, Year Two 13.40%
Short-duration Insurance Contracts, Historical Claims Duration, Year Three 0.60%
Short-duration Insurance Contracts, Historical Claims Duration, Year Four 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Five (0.10%)
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 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Nine 0.00%
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.40%