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General and significant accounting policies (ASU 2018-12 Transition) (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | [1] |  | $ (19,952) |  | $ (18,859) |  |  |
Reinsurance Recoverable Future Policy Benefits | [1] |  | (280) |  | (302) |  |  |
Deferred policy acquisition costs |  |  | 7,152 |  | 6,031 |  |  |
Value of business acquired |  |  | (3,674) |  | (3,702) | $ (235) | $ (263) |
Goodwill |  |  | 19,686 | [2] | 16,228 | 15,213 |  |
Prepaid Reinsurance Premiums |  |  | (3,221) |  | (3,136) |  |  |
Investments in partially-owned insurance companies |  |  | (191) |  | (2,507) |  |  |
Liability for Claims and Claims Adjustment Expense |  |  | (80,122) |  | (75,747) | (72,330) | (67,192) |
Unearned Premiums |  |  | (22,051) |  | (19,713) |  |  |
Future policy benefits |  | $ 7,652 | 13,888 |  | 10,476 | 7,837 |  |
Market risk benefits |  |  | 771 |  | 800 |  |  |
Reinsurance Payable |  |  | (8,302) |  | (7,780) |  |  |
Deferred tax liabilities |  |  | (1,555) |  | (377) |  |  |
Retained earnings |  |  | (54,810) |  | (48,305) |  |  |
Accumulated other comprehensive income |  |  | (6,809) |  | (10,185) |  |  |
Premiums Written, Net |  |  | (47,361) |  | (41,720) | (37,827) |  |
Premiums Earned, Net |  |  | (45,712) |  | (40,360) | (36,292) |  |
Realized Investment Gains (Losses) |  |  | 607 |  | 1,085 | (1,030) |  |
Market Risk Benefit, Change in Fair Value, Gain (Loss) |  |  | 307 |  | (80) | (91) |  |
Policyholder Benefits and Claims Incurred, Net |  |  | (24,100) |  | (22,572) | (21,030) |  |
Policy benefits |  |  | (3,628) |  | (2,314) | (1,740) |  |
Policy acquisition costs |  |  | (8,259) |  | (7,339) | (6,758) |  |
Other (income) expense |  |  | (836) |  | 89 | (2,367) |  |
Income Tax Expense (Benefit) |  |  | (511) |  | (1,239) | (1,269) |  |
Net income (loss) |  |  | (9,028) |  | (5,246) | (8,525) |  |
Current discount rate on future policy benefits |  |  | 84 |  | 1,480 | 387 |  |
Instrument-specific credit risk on market risk benefits |  |  | 2 |  | 33 | 27 |  |
Other Comprehensive Income (Loss), Tax |  |  | (317) |  | 965 | 366 |  |
Comprehensive income (loss) |  |  | 12,376 |  | (3,865) | 6,384 |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  | 12,404 |  | (3,865) | 6,384 |  |
Net Cash Provided by (Used in) Operating Activities, Total |  |  | 12,632 |  | 11,258 | 11,151 |  |
Net Cash Provided by (Used in) Financing Activities |  |  | (4,489) |  | (5,142) | (4,411) |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  |  | 19 |  | 3 | 0 |  |
Equity in net income of subsidiaries and affiliates |  |  | (867) |  | (1) | (2,435) |  |
Increase (Decrease) in Deferred Income Taxes |  |  | (1,124) |  | 318 | (84) |  |
Unpaid losses and loss expenses |  |  | 3,470 |  | 4,259 | 5,178 |  |
Unearned premiums |  |  | 1,377 |  | 1,435 | 1,252 |  |
Future policy benefits |  |  | 848 |  | 333 | 1,040 |  |
Accounts payable, accrued expenses, and other liabilities |  |  | (735) |  | (68) | (2,423) |  |
Reinsurance recoverable |  |  | (498) |  | (1,737) | (1,949) |  |
Increase (Decrease) in Deferred Policy Acquisition Costs |  |  | (1,100) |  | (396) | (422) |  |
Increase (Decrease) in Other Operating Assets and Liabilities, Net |  |  | 1,819 |  | 789 | 3,325 |  |
Net cash flows used for investing activities |  |  | (7,648) |  | (5,654) | (6,659) |  |
Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | 4,742 | [2] | 1,943 | 843 |  |
Future policy benefits |  |  | 12,679 |  | 9,326 | 6,685 |  |
Premiums Written, Net |  |  | (5,465) |  | (3,608) | (2,436) |  |
Premiums Earned, Net |  |  | (5,398) |  | (3,510) | (2,339) |  |
Policyholder Benefits and Claims Incurred, Net |  |  | (114) |  | (85) | (150) |  |
Policy benefits |  |  | (3,216) |  | (1,998) | (1,388) |  |
Policy acquisition costs |  |  | (1,089) |  | (785) | (552) |  |
Other (income) expense |  |  | (115) |  | (30) | (108) |  |
Overseas General Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | 5,262 | [2] | 4,605 | 4,653 |  |
Premiums Written, Net |  |  | (12,575) |  | (11,060) | (10,713) |  |
Premiums Earned, Net |  |  | (12,231) |  | (10,803) | (10,441) |  |
Policyholder Benefits and Claims Incurred, Net |  |  | (5,643) |  | (4,894) | (4,783) |  |
Policy benefits |  |  | (457) |  | (358) | (360) |  |
Policy acquisition costs |  |  | (3,113) |  | (2,818) | (2,799) |  |
Other (income) expense |  |  | (25) |  | 2 | 0 |  |
Term Life Insurance | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 402 |  | 324 | 250 | 125 |
Future policy benefits |  | 454 | 931 |  | 716 | 538 |  |
Policy acquisition costs |  |  | (100) |  | (81) | (47) |  |
Whole Life Insurance | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 534 |  | 392 | 330 | 299 |
Future policy benefits |  | 3,767 | 6,917 |  | 3,919 | 3,537 |  |
Policy acquisition costs |  |  | (23) |  | (18) | (18) |  |
Accident and Health [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Premiums Earned, Net |  |  | (6,233) |  | (4,892) | (3,809) |  |
Accident and Health [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 1,301 |  | 891 | 730 | 733 |
Future policy benefits |  | 2,569 | 4,383 |  | 4,453 | 2,509 |  |
Policy acquisition costs |  |  | (137) |  | (93) | (98) |  |
Accident and Health [Member] | Overseas General Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Future policy benefits |  | 773 |  |  |  |  |  |
Insurance, Other [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 274 |  | 268 | 263 | 220 |
Future policy benefits |  | 89 | 448 |  | 238 | 101 |  |
Policy acquisition costs |  |  | $ (29) |  | (31) | (26) |  |
Variable Annuity [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Market risk benefits |  | 1,163 |  |  |  |  |  |
Previously Reported |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Reinsurance recoverable on losses and loss expenses |  |  |  |  | (18,901) |  |  |
Reinsurance Recoverable Future Policy Benefits |  |  |  |  | (303) |  |  |
Deferred policy acquisition costs |  |  |  |  | 5,788 |  |  |
Value of business acquired |  |  |  |  | (3,596) |  |  |
Prepaid Reinsurance Premiums |  |  |  |  | (3,140) |  |  |
Investments in partially-owned insurance companies |  |  |  |  | (2,877) |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |  | (76,323) |  |  |
Unearned Premiums |  |  |  |  | (20,360) |  |  |
Future policy benefits |  |  |  |  | 10,120 |  | 6,065 | [3]
Market risk benefits |  |  |  |  | 0 |  |  |
Reinsurance Payable |  |  |  |  | (7,795) |  |  |
Deferred tax liabilities |  |  |  |  | (292) |  |  |
Retained earnings |  |  |  |  | (48,334) |  |  |
Accumulated other comprehensive income |  |  |  |  | (10,193) |  |  |
Premiums Written, Net |  |  |  |  | (41,755) | (37,868) |  |
Premiums Earned, Net |  |  |  |  | (40,389) | (36,355) |  |
Realized Investment Gains (Losses) |  |  |  |  | 965 | (1,152) |  |
Market Risk Benefit, Change in Fair Value, Gain (Loss) |  |  |  |  | 0 | 0 |  |
Policyholder Benefits and Claims Incurred, Net |  |  |  |  | (23,342) | (21,980) |  |
Policy benefits |  |  |  |  | (1,492) | (699) |  |
Policy acquisition costs |  |  |  |  | (7,392) | (6,918) |  |
Other (income) expense |  |  |  |  | 74 | (2,365) |  |
Income Tax Expense (Benefit) |  |  |  |  | (1,255) | (1,277) |  |
Net income (loss) |  |  |  |  | (5,313) | (8,539) |  |
Current discount rate on future policy benefits |  |  |  |  | 0 | 0 |  |
Instrument-specific credit risk on market risk benefits |  |  |  |  | 0 | 0 |  |
Other Comprehensive Income (Loss), Tax |  |  |  |  | (1,121) | (427) |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  | (5,230) | 6,020 |  |
Net Cash Provided by (Used in) Operating Activities, Total |  |  |  |  | 11,243 | 11,149 |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  | (5,127) | (4,409) |  |
Previously Reported | Term Life Insurance | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  | 391 |
Previously Reported | Whole Life Insurance | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  | 2,578 |
Previously Reported | Accident and Health [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  | 2,270 |
Previously Reported | Accident and Health [Member] | Overseas General Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  | 754 |
Previously Reported | Insurance, Other [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  | 72 |
Previously Reported | Variable Annuity [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Market risk benefits |  |  |  |  |  |  | $ 1,138 |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Reinsurance recoverable on losses and loss expenses |  |  |  |  | (42) |  |  |
Reinsurance Recoverable Future Policy Benefits |  |  |  |  | (1) |  |  |
Deferred policy acquisition costs |  |  |  |  | 243 |  |  |
Value of business acquired |  |  |  |  | (106) |  |  |
Prepaid Reinsurance Premiums |  |  |  |  | (4) |  |  |
Investments in partially-owned insurance companies |  |  |  |  | (370) |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |  | (576) |  |  |
Unearned Premiums |  |  |  |  | (647) |  |  |
Future policy benefits |  |  |  |  | 356 |  |  |
Market risk benefits |  |  |  |  | 800 |  |  |
Reinsurance Payable |  |  |  |  | (15) |  |  |
Deferred tax liabilities |  |  |  |  | (85) |  |  |
Retained earnings |  | (52) |  |  | (29) |  |  |
Accumulated other comprehensive income |  | 1,800 |  |  | 8 |  |  |
Premiums Written, Net |  |  |  |  | (35) | (41) |  |
Premiums Earned, Net |  |  |  |  | (29) | (63) |  |
Realized Investment Gains (Losses) |  |  |  |  | (120) | (122) |  |
Market Risk Benefit, Change in Fair Value, Gain (Loss) |  |  |  |  | 80 | 91 |  |
Policyholder Benefits and Claims Incurred, Net |  |  |  |  | (770) | (950) |  |
Policy benefits |  |  |  |  | 822 | 1,041 |  |
Policy acquisition costs |  |  |  |  | (53) | (160) |  |
Other (income) expense |  |  |  |  | 15 | (2) |  |
Income Tax Expense (Benefit) |  |  |  |  | (16) | (8) |  |
Net income (loss) |  |  |  |  | (67) | (14) |  |
Current discount rate on future policy benefits |  |  |  |  | 1,480 | 387 |  |
Instrument-specific credit risk on market risk benefits |  |  |  |  | 33 | 27 |  |
Other Comprehensive Income (Loss), Tax |  |  |  |  | 156 | 61 |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  | 1,365 | 364 |  |
Net Cash Provided by (Used in) Operating Activities, Total |  |  |  |  | 15 | 2 |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  | $ (15) | $ (2) |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  | 1,587 |  |  |  |  |  |
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax |  | 77 |  |  |  |  |  |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Term Life Insurance | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  | 63 |  |  |  |  |  |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Whole Life Insurance | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  | 1,189 |  |  |  |  |  |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Accident and Health [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  | 299 |  |  |  |  |  |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Accident and Health [Member] | Overseas General Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  | 19 |  |  |  |  |  |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Insurance, Other [Member] | Life Insurance [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  | 17 |  |  |  |  |  |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 | Guaranteed Minimum Death Benefit |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Market Risk Benefit, Change in Fair Value, Gain (Loss) |  | 59 |  |  |  |  |  |
OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), before Adjustments and Tax | [4] | $ 84 |  |  |  |  |  |
[1] | Net of valuation allowance for uncollectible reinsurance.
[2] | At December 31, 2023, Goodwill from Huatai Group includes approximately $759 million attributable to noncontrolling interests
[3] | Includes future policy benefits previously included within Unpaid losses and loss expenses on the pre-adoption Consolidated balance sheets, primarily certain international A&H business, and excludes deferred profit liability and certain guaranteed minimum death benefits reclassified to Market risk benefits on the post adoption period balance sheets.
[4] | Includes $77 million of instrument-specific credit risk allocated from retained earnings to AOCI.

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