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Unpaid Claims and Claim Expense Short Duration Contracts (Claims Development) (Details) - Life Insurance Product Line [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net |  | $ 1,256 |  |  |  |  |  |  |  |  |
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 1,451 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | [1] | 91 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 1,869 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | [1] | 509 |  |  |  |  |  |  |  |  |
Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 4,135 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | [1] | 110 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 4,772 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | [1] | 747 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 259 | $ 255 | $ 251 | $ 244 | $ 234 | $ 221 | $ 199 | $ 171 | $ 131 | $ 33
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 276 | 275 | 276 | 277 | 277 | 275 | 262 | 257 | 290 | 267
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 3 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 382 | 378 | 374 | 368 | 364 | 356 | 349 | 337 | 305 | 129
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 402 | 401 | 401 | 399 | 399 | 396 | 397 | 396 | 411 | $ 408
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 243 | 240 | 235 | 226 | 214 | 195 | 162 | 115 | 47 |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 259 | 258 | 258 | 258 | 258 | 258 | 242 | 249 | 269 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 4 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 450 | 446 | 441 | 437 | 431 | 422 | 407 | 361 | 146 |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 464 | 464 | 463 | 463 | 462 | 462 | 465 | 461 | $ 460 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 187 | 180 | 172 | 161 | 148 | 129 | 94 | 37 |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 211 | 210 | 209 | 212 | 213 | 206 | 199 | 220 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 3 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 477 | 472 | 467 | 460 | 451 | 437 | 393 | 185 |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 500 | 499 | 498 | 497 | 497 | 501 | 500 | $ 501 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 169 | 160 | 147 | 132 | 111 | 84 | 34 |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 198 | 196 | 198 | 210 | 207 | 207 | 205 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 2 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 478 | 474 | 468 | 462 | 448 | 403 | 190 |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 503 | 504 | 503 | 504 | 509 | 514 | $ 485 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 206 | 191 | 171 | 142 | 103 | 31 |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 239 | 239 | 245 | 256 | 262 | 245 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 4 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 494 | 489 | 479 | 465 | 415 | 183 |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 519 | 520 | 517 | 524 | 538 | $ 538 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 0 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 194 | 174 | 136 | 99 | 37 |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 253 | 251 | 260 | 253 | 245 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 8 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 432 | 428 | 418 | 372 | 180 |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 453 | 453 | 456 | 473 | $ 491 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 2 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2019 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 95 | 80 | 53 | 22 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 145 | 142 | 141 | 145 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 14 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2019 [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 394 | 388 | 356 | 159 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 415 | 415 | 426 | $ 469 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 3 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2020 | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 34 | 23 | 8 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 61 | 61 | 67 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 7 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2020 | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 454 | 414 | 177 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 493 | 492 | $ 509 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 4 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2021 | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 42 | 11 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 96 | 93 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 21 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2021 | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 395 | 182 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 480 | 519 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 33 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2022 | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] | 22 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 131 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 76 |  |  |  |  |  |  |  |  |
Short-Duration Insurance Contract, Accident Year 2022 | Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | [1] |  | $ 179 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 543 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | $ 240 |  |  |  |  |  |  |  |  |
[1] | 2014 – 2022 unaudited.

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