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Insurance (Liabilities for Unpaid Claims and Claims Expense - Development Tables) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Claims
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Claims Development [Line Items]                      
Total unpaid claims and claim adjustment expenses, net of reinsurance $ 12,644                    
Group Life - Term                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 72,533                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 70,179                    
All outstanding liabilities for incurral years not separately stated, net of reinsurance 18                    
Total unpaid claims and claim adjustment expenses, net of reinsurance $ 2,372                    
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%                    
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2011                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 6,299 $ 6,297 $ 6,295 $ 6,294 $ 6,295 $ 6,287 $ 6,269 $ 6,293 $ 6,290 $ 6,318  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1                    
Cumulative Number of Reported Claims | Claims 208,202                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 6,297 6,296 6,295 6,292 6,290 6,281 6,256 6,239 6,194 4,982  
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2012                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 6,574 6,572 6,569 6,569 6,568 6,546 6,569 6,579 6,503    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1                    
Cumulative Number of Reported Claims | Claims 209,960                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 6,572 6,569 6,566 6,565 6,558 6,532 6,518 6,472 5,132    
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2013                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 6,724 6,723 6,720 6,730 6,720 6,719 6,713 6,637      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1                    
Cumulative Number of Reported Claims | Claims 212,572                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 6,721 6,720 6,715 6,711 6,678 6,664 6,614 5,216      
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2014                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 6,920 6,919 6,914 6,910 6,913 6,919 6,986        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 3                    
Cumulative Number of Reported Claims | Claims 215,388                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 6,915 6,912 6,902 6,869 6,858 6,809 5,428        
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2015                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,025 7,024 7,021 7,014 7,015 7,040          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 3                    
Cumulative Number of Reported Claims | Claims 217,729                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,018 7,008 6,974 6,958 6,913 5,524          
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2016                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,105 7,104 7,095 7,085 7,125            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 6                    
Cumulative Number of Reported Claims | Claims 218,487                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,086 7,053 7,034 6,980 5,582            
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2017                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,427 7,425 7,418 7,432              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 9                    
Cumulative Number of Reported Claims | Claims 257,925                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,374 7,355 7,292 5,761              
Group Life - Term | Short-duration Insurance Contracts, Accident Year 2018                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,646 7,655 7,757                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 14                    
Cumulative Number of Reported Claims | Claims 242,815                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,578 7,521 6,008                
Group Life - Term | Short-Duration Insurance Contracts, Accident Year 2019                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 7,900 7,935                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 23                    
Cumulative Number of Reported Claims | Claims 239,317                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 7,756 6,178                  
Group Life - Term | Short-Duration Insurance Contract, Accident Year 2020                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 8,913                    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 757                    
Cumulative Number of Reported Claims | Claims 206,427                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 6,862                    
Group Life - Term | Asia                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 2,655                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 1,874                    
All outstanding liabilities for incurral years not separately stated, net of reinsurance 11                    
Total unpaid claims and claim adjustment expenses, net of reinsurance $ 792                    
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.80%                    
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2011                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 118 120 127 130 123 93 87 87 66 63  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 3                    
Cumulative Number of Reported Claims | Claims 3,561                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 115 114 110 107 100 80 66 53 40 12  
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2012                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 124 125 132 121 117 117 101 103 96    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 5                    
Cumulative Number of Reported Claims | Claims 5,586                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 119 115 112 110 105 97 84 64 30    
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2013                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 177 174 174 165 166 171 148 147      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 12                    
Cumulative Number of Reported Claims | Claims 6,503                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 166 157 161 147 134 120 98 43      
Group Life - Term | Asia | Short-duration Insurance Contracts, Accident Year 2014                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 261 260 265 253 252 275 292        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 25                    
Cumulative Number of Reported Claims | Claims 6,706                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 237 225 224 199 177 142 69        
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 275 272 260 267 264 276          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 27                    
Cumulative Number of Reported Claims | Claims 6,570                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 248 232 205 190 152 80          
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 239 236 221 235 231            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 32                    
Cumulative Number of Reported Claims | Claims 4,472                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 206 190 152 133 65            
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 307 286 278 299              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 52                    
Cumulative Number of Reported Claims | Claims 5,052                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 255 208 157 87              
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 347 333 365                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 110                    
Cumulative Number of Reported Claims | Claims 5,097                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 237 176 96                
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 369 394                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 175                    
Cumulative Number of Reported Claims | Claims 4,530                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 194 106                  
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 438                    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 341                    
Cumulative Number of Reported Claims | Claims 2,429                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 97                    
Group Long-Term Disability                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 11,093                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 5,657                    
All outstanding liabilities for incurral years not separately stated, net of reinsurance 1,543                    
Total unpaid claims and claim adjustment expenses, net of reinsurance $ 6,979                    
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 3.60%                    
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2011                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 910 914 917 918 923 924 914 894 916 955  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 21,644                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 703 670 635 588 537 478 411 337 217 44  
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2012                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,011 1,015 1,021 1,037 1,034 1,014 980 979 966    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 20,086                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 730 694 648 591 524 453 365 229 43    
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2013                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,032 1,044 1,069 1,070 1,049 1,032 1,027 1,008      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 21,138                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 722 676 622 551 475 382 234 43      
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2014                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,097 1,098 1,109 1,101 1,079 1,077 1,076        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 22,852                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 732 677 609 526 428 266 51        
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2015                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 21,209                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 665 601 524 427 264 50          
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2016                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 17,967                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 628 548 433 267 49            
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2017                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,195 1,203 1,202 1,244              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 16,313                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 579 476 290 56              
Group Long-Term Disability | Short-duration Insurance Contracts, Accident Year 2018                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,163 1,175 1,240                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 7                    
Cumulative Number of Reported Claims | Claims 15,135                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 497 314 54                
Group Long-Term Disability | Short-Duration Insurance Contracts, Accident Year 2019                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,212 1,277                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 33                    
Cumulative Number of Reported Claims | Claims 15,044                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 342 57                  
Group Long-Term Disability | Short-Duration Insurance Contract, Accident Year 2020                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,253                    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 630                    
Cumulative Number of Reported Claims | Claims 8,387                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 59                    
Protection Life                      
Claims Development [Line Items]                      
Total unpaid claims and claim adjustment expenses, net of reinsurance 404                    
Protection Life | Latin America                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 3,168                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 2,772                    
All outstanding liabilities for incurral years not separately stated, net of reinsurance 8                    
Total unpaid claims and claim adjustment expenses, net of reinsurance $ 404                    
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.00%                    
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2011                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 207 207 207 204 208 208   208 207 201 $ 129
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 27,458                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 206 206 204 204 203 203   203 202 197 $ 127
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2012                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 195 193 192 191 193 193   191 187 138  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 27,645                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 192 192 190 189 190 190   188 184 136  
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2013                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 221 221 220 218 219 218   212 150    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 32,040                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 214 213 211 209 210 210   205 147    
Protection Life | Latin America | Short-duration Insurance Contracts, Accident Year 2014                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 328 327 326 323 354 345   226      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 40,796                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 316 315 313 309 306 301   201      
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 401 399 399 395 424 295          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 46,605                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 376 373 367 360 339 240          
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 428 427 420 409 313            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 40,431                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 424 421 414 395 221            
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 313 314 314 323              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ (1)                    
Cumulative Number of Reported Claims | Claims 32,201                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 306 302 286 191              
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 288 290 300                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1                    
Cumulative Number of Reported Claims | Claims 30,565                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 268 257 151                
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 297 325                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 10                    
Cumulative Number of Reported Claims | Claims 32,072                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 257 169                  
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 490                    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 201                    
Cumulative Number of Reported Claims | Claims 26,643                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 213                    
Protection Health                      
Claims Development [Line Items]                      
Total unpaid claims and claim adjustment expenses, net of reinsurance 106                    
Protection Health | Latin America                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 2,910                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance 2,808                    
All outstanding liabilities for incurral years not separately stated, net of reinsurance 4                    
Total unpaid claims and claim adjustment expenses, net of reinsurance $ 106                    
Short-duration Insurance Contracts, Historical Claims Duration, Year Ten 0.40%                    
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2011                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 237 236 236 236 239 239 239 238 236 212  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 106,659                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 237 236 236 236 239 239 238 238 236 $ 212  
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2012                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 232 232 232 232 233 233 232 230 205    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 100,420                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 232 232 232 232 233 233 232 230 $ 205    
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2013                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 251 250 250 250 253 252 251 222      
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 104,293                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 250 250 250 250 253 252 251 $ 222      
Protection Health | Latin America | Short-duration Insurance Contracts, Accident Year 2014                      
Claims Development [Line Items]                      
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 256 255 256 257 259 257 231        
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 97,855                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 254 253 253 253 257 255 $ 229        
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 225 225 226 227 225 198          
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 0                    
Cumulative Number of Reported Claims | Claims 87,290                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 225 225 225 224 225 $ 198          
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 297 297 296 299 260            
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 1                    
Cumulative Number of Reported Claims | Claims 106,170                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 296 295 295 292 $ 244            
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 350 351 350 376              
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 2                    
Cumulative Number of Reported Claims | Claims 120,810                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 349 348 346 $ 307              
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 401 423 403                
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 4                    
Cumulative Number of Reported Claims | Claims 143,040                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 395 392 $ 344                
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 175 134                  
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 9                    
Cumulative Number of Reported Claims | Claims 127,651                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 159 $ 113                  
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 486                    
Total IBNR Liabilities Plus Expected Development on Reported Claims $ 44                    
Cumulative Number of Reported Claims | Claims 103,841                    
Cumulative paid claims and paid allocated claim adjustment expenses, net of reinsurance $ 411