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Policy Claims and Benefits (Claims Development) (Details) - Life Insurance Product Line [Member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | [1] | Dec. 31, 2018 | [1] | Dec. 31, 2017 | [1] | Dec. 31, 2016 | [1] | Dec. 31, 2015 | [1] | Dec. 31, 2014 | [1] | Dec. 31, 2013 | [1] | Dec. 31, 2012 | [1]
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net |  | $ 1,594 |  |  |  |  |  |  |  |
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net |  | 1,809 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented |  | 90 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 2,525 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net |  | 806 |  |  |  |  |  |  |  |
Americas [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net |  | 3,303 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented |  | 131 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | [1] | 3,960 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net |  | 788 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net |  | 318 | $ 310 | $ 300 | $ 284 | $ 266 | $ 243 | $ 202 | $ 148 | $ 54
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 345 | 343 | 338 | 332 | 321 | 313 | 309 | 305 | 227
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 5 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net |  | 275 | 272 | 268 | 264 | 258 | 252 | 244 | 222 | 109
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 296 | 297 | 297 | 298 | 299 | 298 | 297 | 309 | $ 323
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 0 |  |  |  |  |  |  |  |
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 |  | 332 | 322 | 309 | 285 | 258 | 229 | 157 | 54 |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 359 | 361 | 358 | 343 | 329 | 332 | 342 | 320 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 7 |  |  |  |  |  |  |  |
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 |  | 305 | 302 | 297 | 292 | 286 | 277 | 249 | 114 |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 335 | 337 | 336 | 336 | 337 | 339 | 333 | $ 349 |
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 |  | 276 | 265 | 250 | 225 | 194 | 148 | 38 |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 313 | 312 | 310 | 296 | 290 | 328 | 302 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 9 |  |  |  |  |  |  |  |
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 |  | 368 | 364 | 356 | 349 | 337 | 305 | 129 |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 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 2015 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net |  | 255 | 242 | 221 | 183 | 129 | 53 |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 292 | 291 | 292 | 273 | 281 | 304 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 14 |  |  |  |  |  |  |  |
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 |  | 437 | 431 | 422 | 407 | 361 | 146 |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 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 2016 [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net |  | 182 | 167 | 145 | 107 | 42 |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 240 | 240 | 232 | 225 | 248 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 15 |  |  |  |  |  |  |  |
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 |  | 460 | 451 | 437 | 393 | 185 |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 497 | 497 | 501 | 500 | $ 501 |  |  |  |
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 |  | 149 | 126 | 95 | 39 |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 237 | 234 | 234 | 232 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 21 |  |  |  |  |  |  |  |
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 |  | 462 | 448 | 403 | 190 |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 504 | 509 | 514 | $ 485 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 3 |  |  |  |  |  |  |  |
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 |  | 160 | 116 | 35 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 290 | 295 | 277 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 50 |  |  |  |  |  |  |  |
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 |  | 465 | 415 | 183 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 524 | 538 | $ 538 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 8 |  |  |  |  |  |  |  |
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 |  | 111 | 42 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 286 | 277 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 82 |  |  |  |  |  |  |  |
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 |  | 372 | 180 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 473 | $ 491 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 30 |  |  |  |  |  |  |  |
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 |  | 26 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 163 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | 84 |  |  |  |  |  |  |  |
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 |  | 159 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net |  | 469 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net |  | $ 197 |  |  |  |  |  |  |  |
[1] | 2012-2019 Unaudited.

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