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Future Policy Benefits (Liabilities for Unpaid Claims and Claims Expense - Development Tables) (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Claims
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Claims Development [Line Items]                    
Total unpaid claims and claim adjustment expenses, net of reinsurance $ 14,416                  
Group Life - Term                    
Claims Development [Line Items]                    
Total unpaid claims and claim adjustment expenses, net of reinsurance 3,159                  
Group Life - Term | Group Benefits                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 86,367                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 83,214                  
All outstanding liabilities for incurral years not separately stated, net of reinsurance 6                  
Total unpaid claims and claim adjustment expenses, net of reinsurance 3,159                  
Group Life - Term | Group Benefits | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,030 $ 7,028 $ 7,026 $ 7,026 $ 7,025 $ 7,024 $ 7,021 $ 7,014 $ 7,015 $ 7,040
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | Claims 219,340                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,029 7,027 7,024 7,022 7,018 7,008 6,974 6,958 6,913 5,524
Group Life - Term | Group Benefits | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,110 7,109 7,107 7,104 7,105 7,104 7,095 7,085 7,125  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | Claims 221,405                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,109 7,106 7,100 7,096 7,086 7,053 7,034 6,980 5,582  
Group Life - Term | Group Benefits | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,434 7,432 7,428 7,428 7,427 7,425 7,418 7,432    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 2                  
Cumulative Number of Reported Claims | Claims 264,746                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,431 7,427 7,414 7,400 7,374 7,355 7,292 5,761    
Group Life - Term | Group Benefits | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,659 7,652 7,651 7,650 7,646 7,655 7,757      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 3                  
Cumulative Number of Reported Claims | Claims 253,393                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,652 7,646 7,629 7,595 7,578 7,521 6,008      
Group Life - Term | Group Benefits | Short-Duration Insurance Contracts, Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,921 7,914 7,917 7,907 7,900 7,935        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | Claims 255,494                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,908 7,898 7,853 7,820 7,756 6,178        
Group Life - Term | Group Benefits | Short-Duration Insurance Contract, Accident Year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 9,388 9,384 9,389 9,367 8,913          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 6                  
Cumulative Number of Reported Claims | Claims 302,292                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 9,353 9,296 9,242 9,103 6,862          
Group Life - Term | Group Benefits | Short-Duration Insurance Contract, Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 10,783 10,777 10,795 10,555            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 10                  
Cumulative Number of Reported Claims | Claims 335,468                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 10,689 10,640 10,476 8,008            
Group Life - Term | Group Benefits | Short-Duration Insurance Contract, Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 9,662 9,653 9,640              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 21                  
Cumulative Number of Reported Claims | Claims 335,417                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 9,536 9,399 7,101              
Group Life - Term | Group Benefits | Short-Duration Insurance Contract, Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 9,471 9,584                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 43                  
Cumulative Number of Reported Claims | Claims 314,144                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 9,225 6,929                
Group Life - Term | Group Benefits | Short-Duration Insurance Contract, Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 9,909                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1,226                  
Cumulative Number of Reported Claims | Claims 264,726                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,282                  
Group Life - Term | Asia                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 3,025                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 2,101                  
All outstanding liabilities for incurral years not separately stated, net of reinsurance 14                  
Total unpaid claims and claim adjustment expenses, net of reinsurance 938                  
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 220 222 220 223 220 219 209 214 212 222
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 6                  
Cumulative Number of Reported Claims | Claims 6,943                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 215 212 209 205 199 186 165 152 122 64
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 190 197 198 196 191 189 178 188 185  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 10                  
Cumulative Number of Reported Claims | Claims 4,857                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 180 185 180 173 165 152 122 107 52  
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 238 250 248 253 246 230 223 240    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 15                  
Cumulative Number of Reported Claims | Claims 5,847                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 223 230 221 219 205 167 126 70    
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 273 289 282 288 279 267 293      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 30                  
Cumulative Number of Reported Claims | Claims 6,297                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 243 250 230 222 190 141 77      
Group Life - Term | Asia | Short-Duration Insurance Contracts, Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 295 314 306 310 296 316        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 37                  
Cumulative Number of Reported Claims | Claims 6,461                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 257 262 234 202 156 85        
Group Life - Term | Asia | Short-Duration Insurance Contract, Accident Year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 280 309 302 327 352          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 61                  
Cumulative Number of Reported Claims | Claims 5,728                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 219 215 186 140 78          
Group Life - Term | Asia | Short-Duration Insurance Contract, Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 346 366 349 335            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 97                  
Cumulative Number of Reported Claims | Claims 7,130                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 249 226 156 70            
Group Life - Term | Asia | Short-Duration Insurance Contract, Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 376 412 445              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 110                  
Cumulative Number of Reported Claims | Claims 8,144                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 266 204 81              
Group Life - Term | Asia | Short-Duration Insurance Contract, Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 344 411                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 175                  
Cumulative Number of Reported Claims | Claims 6,690                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 168 86                
Group Life - Term | Asia | Short-Duration Insurance Contract, Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 463                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 382                  
Cumulative Number of Reported Claims | Claims 4,295                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 81                  
Group Long-Term Disability                    
Claims Development [Line Items]                    
Total unpaid claims and claim adjustment expenses, net of reinsurance 8,049                  
Group Long-Term Disability | Group Benefits                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 13,562                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 6,981                  
All outstanding liabilities for incurral years not separately stated, net of reinsurance 1,468                  
Total unpaid claims and claim adjustment expenses, net of reinsurance 8,049                  
Group Long-Term Disability | Group Benefits | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,069 1,078 1,086 1,067 1,081 1,087 1,100 1,093 1,105 1,082
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 21,220                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 844 801 764 718 665 601 524 427 264 50
Group Long-Term Disability | Group Benefits | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,108 1,086 1,123 1,124 1,139 1,162 1,159 1,139 1,131  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 17,974                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 839 769 750 696 628 548 433 267 49  
Group Long-Term Disability | Group Benefits | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,135 1,101 1,181 1,165 1,195 1,203 1,202 1,244    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 16,329                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 812 718 719 655 579 476 290 56    
Group Long-Term Disability | Group Benefits | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,150 1,102 1,170 1,147 1,163 1,175 1,240      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 15,216                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 775 663 666 594 497 314 54      
Group Long-Term Disability | Group Benefits | Short-Duration Insurance Contracts, Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,166 1,103 1,177 1,169 1,212 1,277        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 15,426                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 764 621 620 522 342 57        
Group Long-Term Disability | Group Benefits | Short-Duration Insurance Contract, Accident Year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,158 1,100 1,155 1,223 1,253          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 15,813                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 706 560 535 355 59          
Group Long-Term Disability | Group Benefits | Short-Duration Insurance Contract, Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,586 1,477 1,608 1,552            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 19,663                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 902 620 505 95            
Group Long-Term Disability | Group Benefits | Short-Duration Insurance Contract, Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,578 1,732 1,641              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 7                  
Cumulative Number of Reported Claims | Claims 18,364                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 721 609 76              
Group Long-Term Disability | Group Benefits | Short-Duration Insurance Contract, Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,722 1,725                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 41                  
Cumulative Number of Reported Claims | Claims 20,089                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 520 84                
Group Long-Term Disability | Group Benefits | Short-Duration Insurance Contract, Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,890                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 840                  
Cumulative Number of Reported Claims | Claims 12,419                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 98                  
Protection Life                    
Claims Development [Line Items]                    
Total unpaid claims and claim adjustment expenses, net of reinsurance 386                  
Protection Life | Latin America                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 3,746                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 3,366                  
All outstanding liabilities for incurral years not separately stated, net of reinsurance 6                  
Total unpaid claims and claim adjustment expenses, net of reinsurance 386                  
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 361 362 362 371 376 375 375 371 399 277
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 38,843                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 348 347 346 354 353 351 345 339 319 225
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 399 394 395 404 403 402 396 385 293  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 40,548                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 397 397 396 402 400 397 390 373 208  
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 287 285 285 293 293 294 294 302    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 30,762                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 285 283 282 289 286 283 268 179    
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 272 269 270 271 269 271 280      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 28,549                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 255 254 252 255 251 240 141      
Protection Life | Latin America | Short-Duration Insurance Contracts, Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 277 278 277 279 276 303        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 31,620                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 259 258 255 257 239 157        
Protection Life | Latin America | Short-Duration Insurance Contract, Accident Year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 465 467 464 459 459          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 2                  
Cumulative Number of Reported Claims | Claims 43,289                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 418 415 408 397 198          
Protection Life | Latin America | Short-Duration Insurance Contract, Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 502 505 505 580            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 5                  
Cumulative Number of Reported Claims | Claims 51,427                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 466 435 418 299            
Protection Life | Latin America | Short-Duration Insurance Contract, Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 374 378 400              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 7                  
Cumulative Number of Reported Claims | Claims 42,230                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 351 331 247              
Protection Life | Latin America | Short-Duration Insurance Contract, Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 360 389                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 21                  
Cumulative Number of Reported Claims | Claims 39,931                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 348 254                
Protection Life | Latin America | Short-Duration Insurance Contract, Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 449                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 177                  
Cumulative Number of Reported Claims | Claims 41,577                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 239                  
Protection Health                    
Claims Development [Line Items]                    
Total unpaid claims and claim adjustment expenses, net of reinsurance 187                  
Protection Health | Latin America                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 4,825                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 4,641                  
All outstanding liabilities for incurral years not separately stated, net of reinsurance 3                  
Total unpaid claims and claim adjustment expenses, net of reinsurance 187                  
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 216 217 217 216 216 216 216 217 216 190
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 87,903                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 217 217 217 216 216 216 215 215 216 $ 190
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 286 285 285 284 284 284 284 287 249  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 107,119                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 285 285 284 284 284 283 283 280 $ 234  
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 337 336 336 335 336 336 336 360    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 122,264                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 337 336 336 335 334 333 332 $ 294    
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 384 383 383 383 385 406 386      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 145,387                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 382 382 381 380 379 376 $ 330      
Protection Health | Latin America | Short-Duration Insurance Contracts, Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 163 162 161 162 168 129        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | Claims 133,704                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 161 160 158 156 152 $ 108        
Protection Health | Latin America | Short-Duration Insurance Contract, Accident Year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 456 455 456 458 466          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | Claims 151,310                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 454 452 449 445 $ 394          
Protection Health | Latin America | Short-Duration Insurance Contract, Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 599 597 600 598            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | Claims 173,394                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 593 589 585 $ 528            
Protection Health | Latin America | Short-Duration Insurance Contract, Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 645 643 652              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 9                  
Cumulative Number of Reported Claims | Claims 202,198                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 636 628 $ 552              
Protection Health | Latin America | Short-Duration Insurance Contract, Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 813 823                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 19                  
Cumulative Number of Reported Claims | Claims 216,489                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 791 $ 699                
Protection Health | Latin America | Short-Duration Insurance Contract, Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 926                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 81                  
Cumulative Number of Reported Claims | Claims 165,589                  
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 785