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General and significant accounting policies (ASU 2018-12 Transition) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2021 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | 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] |  | $ (18,398) |  | $ (18,398) |  | $ (18,859) |  |  |
Reinsurance recoverable on policy benefits | [1] |  | (315) |  | (315) |  | (302) |  |  |
Deferred policy acquisition costs |  |  | 6,666 |  | 6,666 |  | 6,031 |  |  |
Value of business acquired |  |  | (3,575) |  | (3,575) |  | (3,702) |  |  |
Prepaid reinsurance premiums |  |  | (3,599) |  | (3,599) |  | (3,136) |  |  |
Investments in partially-owned insurance companies |  |  | (3,542) |  | (3,542) |  | (2,507) |  |  |
Unpaid losses and loss expenses |  |  | (76,480) | $ (73,448) | (76,480) | $ (73,448) | (75,747) | $ (72,330) |  |
Unearned premiums |  |  | (21,860) |  | (21,860) |  | (19,713) |  |  |
Future policy benefits |  | $ 7,652 | 11,064 | 6,756 | 11,064 | 6,756 | 10,476 |  |  |
Market risk benefits |  |  | 722 |  | 722 |  | 800 |  |  |
Insurance and reinsurance balances payable |  |  | (8,429) |  | (8,429) |  | (7,780) |  |  |
Deferred tax liabilities |  |  | (533) |  | (533) |  | (377) |  |  |
Retained earnings |  |  | (49,467) |  | (49,467) |  | (48,305) |  |  |
Accumulated other comprehensive income (loss) (AOCI) |  |  | (9,822) |  | (9,822) |  | (10,185) |  |  |
Net premiums written |  |  | (11,951) | (10,293) | (22,661) | (19,482) |  |  |  |
Net premiums earned |  |  | (10,999) | (9,549) | (21,141) | (18,286) |  |  |  |
Net realized (gains) losses |  |  | 304 | 503 | 381 | 480 |  |  |  |
Market risk benefits gains (losses) |  |  | 7 | 33 | 122 | (16) |  |  |  |
Losses and loss expenses |  |  | (5,683) | (5,206) | (10,831) | (9,770) |  |  |  |
Policy benefits |  |  | (830) | (361) | (1,627) | (734) |  |  |  |
Policy acquisition costs |  |  | (2,016) | (1,726) | (3,964) | (3,445) |  |  |  |
Other (income) expense |  |  | (100) | 101 | (396) | (211) |  |  |  |
Income Tax (Expense) Benefit |  |  | (392) | (291) | (776) | (644) |  |  |  |
Net income (loss) |  |  | (1,793) | (1,190) | (3,685) | (3,143) |  |  |  |
Current discount rate on future policy benefits |  |  | (35) | 632 | (186) | 1,067 |  |  |  |
Instrument-specific credit risk on market risk benefits |  |  | 11 | 17 | 8 | 40 |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  | 28 | 183 | (104) | 962 |  |  |  |
Comprehensive income (loss) |  |  | 866 | (3,073) | 4,048 | (4,449) |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  | 4,766 | 5,166 |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  | (2,312) | (725) |  |  |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  |  | 5 | 0 | 4 | 6 |  |  |  |
Equity in net income of partially-owned entities | [2] |  | (120) | 72 | (460) | (291) |  |  |  |
Increase (Decrease) in Deferred Income Taxes |  |  |  |  | 43 | 108 |  |  |  |
Unpaid losses and loss expenses |  |  |  |  | 561 | 1,949 |  |  |  |
Unearned premiums |  |  |  |  | 1,913 | 1,554 |  |  |  |
Future policy benefits |  |  |  |  | 351 | 99 |  |  |  |
Accounts payable, accrued expenses, and other liabilities |  |  |  |  | (388) | 67 |  |  |  |
Reinsurance recoverable |  |  |  |  | 455 | (642) |  |  |  |
Increase (Decrease) in Deferred Policy Acquisition Costs |  |  |  |  | (546) | (232) |  |  |  |
Increase (Decrease) in Other Operating Assets and Liabilities, Net |  |  |  |  | 39 | (370) |  |  |  |
Net cash flows used for investing activities |  |  |  |  | (2,262) | 1,125 |  |  |  |
Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  | (1,270) | (562) | (2,563) | (1,138) |  |  |  |
Net premiums earned |  |  | (1,256) | (539) | (2,520) | (1,081) |  |  |  |
Losses and loss expenses |  |  | (35) | (27) | (67) | (51) |  |  |  |
Policy benefits |  |  | (705) | (298) | (1,417) | (609) |  |  |  |
Policy acquisition costs |  |  | (277) | (138) | (550) | (271) |  |  |  |
Other (income) expense |  |  | (26) | (12) | (41) | (42) |  |  |  |
Overseas General Insurance [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  | (2,885) | (2,640) | (6,148) | (5,719) |  |  |  |
Net premiums earned |  |  | (2,908) | (2,696) | (5,694) | (5,324) |  |  |  |
Losses and loss expenses |  |  | (1,267) | (1,143) | (2,504) | (2,439) |  |  |  |
Policy benefits |  |  | (137) | (81) | (247) | (174) |  |  |  |
Policy acquisition costs |  |  | (746) | (697) | (1,459) | (1,376) |  |  |  |
Other (income) expense |  |  | (10) | 3 | (19) | 5 |  |  |  |
Term Life Insurance | Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 356 | 283 | 356 | 283 | 320 | 246 |  |
Future policy benefits |  | 454 | 892 | 573 | 892 | 573 |  |  |  |
Policy acquisition costs |  |  |  |  | (49) | (36) |  |  |  |
Whole Life Insurance | Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 456 | 336 | 456 | 336 | 395 | 334 |  |
Future policy benefits |  | 3,767 | 4,947 | 3,101 | 4,947 | 3,101 |  |  |  |
Policy acquisition costs |  |  |  |  | (11) | (9) |  |  |  |
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 1,081 | 740 | 1,081 | 740 | 902 | 745 |  |
Future policy benefits |  | 2,569 | 4,242 | 2,222 | 4,242 | 2,222 |  |  |  |
Policy acquisition costs |  |  |  |  | (63) | (47) |  |  |  |
Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Future policy benefits |  | 773 | 751 | 748 | 751 | 748 |  |  |  |
Insurance, Other | Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 118 | 118 | 118 | 118 | 121 | $ 108 |  |
Future policy benefits |  | 89 | $ 232 | 112 | 232 | 112 |  |  |  |
Policy acquisition costs |  |  |  |  | $ (10) | (10) |  |  |  |
Variable Annuity |  |  |  |  |  |  |  |  |  |
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 on 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) |  |  |
Unpaid losses and loss expenses |  |  |  |  |  |  | (76,323) |  |  |
Unearned premiums |  |  |  |  |  |  | (20,360) |  |  |
Future policy benefits |  |  |  |  |  |  | 10,120 |  | $ 6,065 | [3]
Market risk benefits |  |  |  |  |  |  | 0 |  |  |
Insurance and reinsurance balances payable |  |  |  |  |  |  | (7,795) |  |  |
Deferred tax liabilities |  |  |  |  |  |  | (292) |  |  |
Retained earnings |  |  |  |  |  |  | (48,334) |  |  |
Accumulated other comprehensive income (loss) (AOCI) |  |  |  |  |  |  | (10,193) |  |  |
Net premiums written |  |  |  | (10,302) |  | (19,501) |  |  |  |
Net premiums earned |  |  |  | (9,557) |  | (18,303) |  |  |  |
Net realized (gains) losses |  |  |  | 504 |  | 403 |  |  |  |
Market risk benefits gains (losses) |  |  |  | 0 |  | 0 |  |  |  |
Losses and loss expenses |  |  |  | (5,408) |  | (10,195) |  |  |  |
Policy benefits |  |  |  | (159) |  | (304) |  |  |  |
Policy acquisition costs |  |  |  | (1,739) |  | (3,476) |  |  |  |
Other (income) expense |  |  |  | 101 |  | (209) |  |  |  |
Income Tax (Expense) Benefit |  |  |  | (293) |  | (648) |  |  |  |
Net income (loss) |  |  |  | (1,215) |  | (3,189) |  |  |  |
Current discount rate on future policy benefits |  |  |  | 0 |  | 0 |  |  |  |
Instrument-specific credit risk on market risk benefits |  |  |  | 0 |  | 0 |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  |  | (245) |  | (1,057) |  |  |  |
Comprehensive income (loss) |  |  |  | (3,656) |  | (5,436) |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  | 5,160 |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  | (719) |  |  |  |
Previously Reported | Term Life Insurance | Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  |  |  | 391 |
Previously Reported | Whole Life Insurance | Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  |  |  | 2,578 |
Previously Reported | Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  |  |  | 2,270 |
Previously Reported | Accident and Health Insurance Product Line [Member] | Overseas General Insurance [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  |  |  | 754 |
Previously Reported | Insurance, Other | Segment Life [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Future policy benefits | [3] |  |  |  |  |  |  |  | 72 |
Previously Reported | Variable Annuity |  |  |  |  |  |  |  |  |  |
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 on policy benefits |  |  |  |  |  |  | (1) |  |  |
Deferred policy acquisition costs |  |  |  |  |  |  | 243 |  |  |
Value of business acquired |  |  |  |  |  |  | (106) |  |  |
Prepaid reinsurance premiums |  |  |  |  |  |  | (4) |  |  |
Investments in partially-owned insurance companies |  |  |  |  |  |  | (370) |  |  |
Unpaid losses and loss expenses |  |  |  |  |  |  | (576) |  |  |
Unearned premiums |  |  |  |  |  |  | (647) |  |  |
Future policy benefits |  |  |  |  |  |  | 356 |  |  |
Market risk benefits |  |  |  |  |  |  | 800 |  |  |
Insurance and reinsurance balances payable |  |  |  |  |  |  | (15) |  |  |
Deferred tax liabilities |  |  |  |  |  |  | (85) |  |  |
Retained earnings |  | (52) |  |  |  |  | (29) |  |  |
Accumulated other comprehensive income (loss) (AOCI) |  | 1,800 |  |  |  |  | $ 8 |  |  |
Net premiums written |  |  |  | (9) |  | (19) |  |  |  |
Net premiums earned |  |  |  | (8) |  | (17) |  |  |  |
Net realized (gains) losses |  |  |  | 1 |  | (77) |  |  |  |
Market risk benefits gains (losses) |  |  |  | (33) |  | 16 |  |  |  |
Losses and loss expenses |  |  |  | (202) |  | (425) |  |  |  |
Policy benefits |  |  |  | 202 |  | 430 |  |  |  |
Policy acquisition costs |  |  |  | (13) |  | (31) |  |  |  |
Other (income) expense |  |  |  | 0 |  | (2) |  |  |  |
Income Tax (Expense) Benefit |  |  |  | (2) |  | (4) |  |  |  |
Net income (loss) |  |  |  | (25) |  | (46) |  |  |  |
Current discount rate on future policy benefits |  |  |  | 632 |  | 1,067 |  |  |  |
Instrument-specific credit risk on market risk benefits |  |  |  | 17 |  | 40 |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  |  | 62 |  | 95 |  |  |  |
Comprehensive income (loss) |  |  |  | $ 583 |  | 987 |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  | 6 |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  | $ (6) |  |  |  |
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 | Segment Life [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 | Segment Life [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 Insurance Product Line [Member] | Segment Life [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 Insurance Product Line [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 | Segment Life [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 benefits gains (losses) |  | 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] | Equity in net income (loss) of partially-owned entities includes mark-to-market gains (losses) on private equities where we own more than three percent of $(3) million and $239 million for the three and six months ended June 30, 2023, respectively, and $(134) million and $121 million, respectively, for the prior year periods. This line item also includes net income of $22 million and $36 million attributable to our investments in Huatai for the three and six months ended June 30, 2023, respectively, compared to $15 million and $55 million, respectively, for the prior year periods.
[3] | Includes future policy benefits previously included within Unpaid losses 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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