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Accounting Changes and Error Corrections (Impact by Segment) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
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Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  | $ 38,222 | $ 35,689 | $ 42,406 |  |  |
Deferred policy acquisition costs |  | 4,257 | 4,128 | 3,906 |  |  |
Life Insurance Product Line [Member] | Americas [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | (417) |  | (572) |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 9,428 |  | 11,193 |  |  |
Future policy benefits |  | 9,845 |  | 11,765 |  |  |
Deferred policy acquisition costs |  | 2,109 | 2,087 | 1,981 | $ 1,947 |  |
Life Insurance Product Line [Member] | CANADA | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | (277) |  | (322) |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 3,854 |  | 4,490 |  |  |
Future policy benefits |  | 4,131 |  | 4,812 |  |  |
Deferred policy acquisition costs |  | 171 | 171 | 192 | 191 |  |
Life Insurance Product Line [Member] | EMEA [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | (37) |  | (36) |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,038 |  | 1,192 |  |  |
Future policy benefits |  | 1,075 |  | 1,228 |  |  |
Deferred policy acquisition costs |  | 309 | 294 | 278 | 270 |  |
Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | (99) |  | (115) |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 2,345 |  | 2,490 |  |  |
Future policy benefits |  | 2,444 |  | 2,605 |  |  |
Deferred policy acquisition costs |  | 1,044 | 1,043 | 1,061 | 1,056 |  |
Insurance, Other | Americas [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 0 |  | 0 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 3,994 |  | 4,465 |  |  |
Future policy benefits |  | 3,994 |  | 4,465 |  |  |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  | (18) | 263 | 14 | 254 |  |
Market Risk Benefit, Reinsurance Recoverable, after Allowance |  | 0 |  | 0 |  |  |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  | 259 | 247 | 233 | 262 |  |
Deferred policy acquisition costs |  | 330 | 341 | 298 | 312 |  |
Insurance, Other | CANADA | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 0 |  | 0 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 54 |  | 71 |  |  |
Future policy benefits |  | 54 |  | 71 |  |  |
Deferred policy acquisition costs |  | 0 | 0 | 0 | 0 |  |
Insurance, Other | EMEA [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 0 |  | 0 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 4,725 |  | 5,876 |  |  |
Future policy benefits |  | 4,725 |  | 5,876 |  |  |
Deferred policy acquisition costs |  | 0 | 0 | 0 | 0 |  |
Insurance, Other | Asia Pacific [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 0 |  | 0 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 5,824 |  | 5,181 |  |  |
Future policy benefits |  | 5,824 |  | 5,181 |  |  |
Deferred policy acquisition costs |  | $ 289 | 188 | $ 91 | 81 |  |
Accounting Standards Update 2018-12 |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  | 35,689 |  | 47,449 |  |
Deferred policy acquisition costs |  |  | 4,128 |  | 3,860 |  |
Accounting Standards Update 2018-12 | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  | 35,220 |  | 35,782 |  |
Deferred policy acquisition costs |  |  | 3,974 |  | 3,690 |  |
Accounting Standards Update 2018-12 | Revision of Prior Period, Change in Accounting Principle, Adjustment |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  | 469 |  | 11,667 |  |
Deferred policy acquisition costs |  |  | 154 |  | 170 |  |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | $ 1,462 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  | (421) |  | (697) | (1,123) |
Liability for Future Policy Benefit, after Reinsurance |  |  | 9,053 |  | 13,345 | 16,509 |
Future policy benefits |  |  | 9,474 |  | 14,042 | 17,632 |
Deferred policy acquisition costs |  |  | 2,087 |  | 1,947 |  |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 10,444 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [1] |  |  |  |  | 896 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [2] |  |  |  |  | 1,750 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 4,542 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  | (265) |  | (367) | (386) |
Liability for Future Policy Benefit, after Reinsurance |  |  | 3,686 |  | 5,188 | 5,978 |
Future policy benefits |  |  | 3,951 |  | 5,555 | 6,364 |
Deferred policy acquisition costs |  |  | 171 |  | 191 |  |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 3,477 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [1] |  |  |  |  | 33 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [2] |  |  |  |  | 203 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 2,651 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  | (31) |  | (34) | (85) |
Liability for Future Policy Benefit, after Reinsurance |  |  | 1,010 |  | 1,355 | 2,585 |
Future policy benefits |  |  | 1,041 |  | 1,389 | 2,670 |
Deferred policy acquisition costs |  |  | 294 |  | 270 |  |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 1,379 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [1] |  |  |  |  | 70 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [2] |  |  |  |  | 901 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 320 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  | (100) |  | (116) | (212) |
Liability for Future Policy Benefit, after Reinsurance |  |  | 2,248 |  | 2,895 | 4,207 |
Future policy benefits |  |  | 2,348 |  | 3,011 | 4,419 |
Deferred policy acquisition costs |  |  | 1,043 |  | 1,056 |  |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 3,568 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [1] |  |  |  |  | 463 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [2] |  |  |  |  | 1,160 |
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | (772) |
Accounting Standards Update 2018-12 | Insurance, Other | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 284 |
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  | 0 |  | 0 | 0 |
Liability for Future Policy Benefit, after Reinsurance |  |  | 3,819 |  | 4,947 | 5,883 |
Future policy benefits |  |  | 3,819 |  | 4,947 | 5,883 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  | 263 |  | 254 | 266 | $ 311
Market Risk Benefit, Reinsurance Recoverable, after Allowance |  |  | 0 |  | 0 | 0 |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  | 247 |  | 262 | 266 | $ 266
Deferred policy acquisition costs |  |  | 341 |  | 312 | 368 |
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 5,037 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  |  |  |  | 254 |
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  | 0 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 72 |
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [4] |  |  |  |  | (28) |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | (45) |
Deferred policy acquisition costs |  |  |  |  |  | 114 |
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [5] |  |  |  |  | 17 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 239 |
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 857 |
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  | 0 |  | 0 | 0 |
Liability for Future Policy Benefit, after Reinsurance |  |  | 54 |  | 81 | 49 |
Future policy benefits |  |  | 54 |  | 81 | 49 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Market Risk Benefit, Reinsurance Recoverable, after Allowance |  |  |  |  |  | 0 |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  | 0 |  | 0 | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 16 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  | 20 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [4] |  |  |  |  | 0 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [5] |  |  |  |  | 4 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 9 |
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  | 0 |  | 0 | 0 |
Liability for Future Policy Benefit, after Reinsurance |  |  | 4,634 |  | 6,729 | 6,991 |
Future policy benefits |  |  | 4,634 |  | 6,729 | 6,991 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Market Risk Benefit, Reinsurance Recoverable, after Allowance |  |  |  |  |  | 0 |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  | 0 |  | 0 | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 5,657 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  | 256 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [4] |  |  |  |  | 0 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [5] |  |  |  |  | 67 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 1,011 |
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  | 0 |  | 0 | 0 |
Liability for Future Policy Benefit, after Reinsurance |  |  | 4,496 |  | 5,014 | 1,887 |
Future policy benefits |  |  | 4,496 |  | 5,014 | 1,887 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Market Risk Benefit, Reinsurance Recoverable, after Allowance |  |  |  |  |  | 0 |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  | $ 188 |  | $ 81 | 41 |
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Previously Reported |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | 1,874 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  |  |  |  | 41 |
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Retained Earnings [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  | 8 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [4] |  |  |  |  | 0 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Deferred policy acquisition costs |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Reclassification of Claims and Benefits payable |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits | [5] |  |  |  |  | 2 |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments | Revision of Prior Period, Change in Accounting Principle, Adjustment | Effect Of Changes In Discount Rate Assumptions |  |  |  |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |  |  |  |
Future policy benefits |  |  |  |  |  | $ 3 |
[1] | Includes adjustments for capping the net premium ratio at 100% and eliminating negative reserves on certain issue year cohorts.
[2] | Amount includes certain reclassifications to conform with the revised presentation upon adoption of ASU 2018-12, such as reclassifying claims and benefits payable on long-duration contracts to liability for future policy benefits.
[3] | Includes adjustments for capping the net premium ratio at 100% and eliminating negative reserves on certain issue year cohorts.
[4] | Adjustment to remove amounts associated with unrealized gains and losses previously recorded in AOCI (i.e., “shadow adjustments”).
[5] | Amount includes certain reclassifications to conform with the revised presentation upon adoption of ASU 2018-12, such as reclassifying claims and benefits payable on long-duration contracts to liability for future policy benefits.

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