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General and significant accounting policies (ASU 2018-12 Transition) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 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 |  |  | $ (19,750) | [1] |  | $ (19,750) | [1] |  | $ (18,859) | [2] |  |  |
Reinsurance recoverable on policy benefits | [1],[2] |  | (315) |  |  | (315) |  |  | (302) |  |  |  |
Deferred policy acquisition costs |  |  | 6,856 |  |  | 6,856 |  |  | 6,031 |  |  |  |
Value of business acquired |  |  | (3,675) |  |  | (3,675) |  |  | (3,702) |  |  |  |
Prepaid reinsurance premiums |  |  | (3,514) |  |  | (3,514) |  |  | (3,136) |  |  |  |
Investments in partially-owned insurance companies |  |  | (188) |  |  | (188) |  |  | (2,507) |  |  |  |
Unpaid losses and loss expenses |  |  | (79,705) |  | $ (75,336) | (79,705) |  | $ (75,336) | (75,747) |  | $ (72,330) |  |
Unearned premiums |  |  | (22,684) |  |  | (22,684) |  |  | (19,713) |  |  |  |
Future policy benefits |  | $ 7,652 | 13,109 |  | 9,906 | 13,109 |  | 9,906 | 10,476 |  |  |  |
Market risk benefits |  |  | 770 |  |  | 770 |  |  | 800 |  |  |  |
Insurance and reinsurance balances payable |  |  | (8,481) |  |  | (8,481) |  |  | (7,780) |  |  |  |
Deferred tax liabilities |  |  | (759) |  |  | (759) |  |  | (377) |  |  |  |
Retained earnings |  |  | (51,510) |  |  | (51,510) |  |  | (48,305) |  |  |  |
Accumulated other comprehensive income (loss) (AOCI) |  |  | (11,518) |  |  | (11,518) |  |  | (10,185) |  |  |  |
Net premiums written |  |  | (13,104) |  | (12,012) | (35,765) |  | (31,494) |  |  |  |  |
Net premiums earned |  |  | (12,674) |  | (11,530) | (33,815) |  | (29,816) |  |  |  |  |
Net realized (gains) losses |  |  | 103 |  | 456 | 484 |  | 936 |  |  |  |  |
Market risk benefits gains (losses) |  |  | 32 |  | (69) | 154 |  | (85) |  |  |  |  |
Losses and loss expenses |  |  | (7,106) |  | (7,063) | (17,937) |  | (16,833) |  |  |  |  |
Policy benefits |  |  | (938) |  | (707) | (2,565) |  | (1,441) |  |  |  |  |
Policy acquisition costs |  |  | (2,178) |  | (1,970) | (6,142) |  | (5,415) |  |  |  |  |
Other (income) expense |  |  | (154) |  | 202 | (550) |  | (9) |  |  |  |  |
Income Tax (Expense) Benefit |  |  | (413) |  | (263) | (1,189) |  | (907) |  |  |  |  |
Net income (loss) |  |  | (2,043) |  | (792) | (5,728) |  | (3,935) |  |  |  |  |
Current discount rate on future policy benefits |  |  | 683 |  | 479 | 497 |  | 1,546 |  |  |  |  |
Instrument-specific credit risk on market risk benefits |  |  | (5) |  | 8 | 3 |  | 48 |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  | 0 |  | 109 | (104) |  | 1,071 |  |  |  |  |
Comprehensive income (loss) |  |  | 268 |  | (2,658) | 4,316 |  | (7,107) |  |  |  |  |
Comprehensive income (loss) |  |  | 347 |  | (2,658) | 4,395 |  | (7,107) |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  | 9,446 |  | 8,600 |  |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  | (3,325) |  | (2,730) |  |  |  |  |
Liability for Future Policy Benefit, Remeasurement Gain (Loss) |  |  | 25 |  | 17 | 21 |  | 11 |  |  |  |  |
Equity in net income of partially-owned entities |  |  | (150) |  | 111 | (610) |  | (180) |  |  |  |  |
Increase (Decrease) in Deferred Income Taxes |  |  |  |  |  | 39 |  | 55 |  |  |  |  |
Unpaid losses and loss expenses |  |  |  |  |  | 3,270 |  | 4,805 |  |  |  |  |
Unearned premiums |  |  |  |  |  | 2,085 |  | 1,904 |  |  |  |  |
Future policy benefits |  |  |  |  |  | 570 |  | 117 |  |  |  |  |
Accounts payable, accrued expenses, and other liabilities |  |  |  |  |  | (392) |  | 337 |  |  |  |  |
Reinsurance recoverable |  |  |  |  |  | (388) |  | (1,850) |  |  |  |  |
Increase (Decrease) in Deferred Policy Acquisition Costs |  |  |  |  |  | (832) |  | (355) |  |  |  |  |
Increase (Decrease) in Other Operating Assets and Liabilities, Net |  |  |  |  |  | 796 |  | (95) |  |  |  |  |
Net cash flows used for investing activities |  |  |  |  |  | (5,434) |  | (5,202) |  |  |  |  |
Segment Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  | (1,452) |  | (1,265) | (4,015) |  | (2,403) |  |  |  |  |
Net premiums earned |  |  | (1,442) |  | (1,244) | (3,962) |  | (2,325) |  |  |  |  |
Losses and loss expenses |  |  | (20) |  | (27) | (87) |  | (78) |  |  |  |  |
Policy benefits |  |  | (866) |  | (666) | (2,283) |  | (1,275) |  |  |  |  |
Policy acquisition costs |  |  | (279) |  | (266) | (829) |  | (537) |  |  |  |  |
Other (income) expense |  |  | (28) |  | 4 | (69) |  | (38) |  |  |  |  |
Overseas General Insurance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums written |  |  | (3,211) |  | (2,645) | (9,359) |  | (8,364) |  |  |  |  |
Net premiums earned |  |  | (3,311) |  | (2,741) | (9,005) |  | (8,065) |  |  |  |  |
Losses and loss expenses |  |  | (1,635) |  | (1,333) | (4,139) |  | (3,772) |  |  |  |  |
Policy benefits |  |  | (91) |  | (108) | (338) |  | (282) |  |  |  |  |
Policy acquisition costs |  |  | (827) |  | (720) | (2,286) |  | (2,096) |  |  |  |  |
Other (income) expense |  |  | (10) |  | (2) | (29) |  | 3 |  |  |  |  |
Term Life Insurance | Segment Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 372 |  | 299 | 372 |  | 299 | 320 |  | 246 |  |
Future policy benefits |  | 454 | 947 |  | 740 | 947 |  | 740 |  |  |  |  |
Policy acquisition costs |  |  |  |  |  | (74) |  | (56) |  |  |  |  |
Whole Life Insurance | Segment Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 488 |  | 350 | 488 |  | 350 | 395 |  | 334 |  |
Future policy benefits |  | 3,767 | 6,702 |  | 4,004 | 6,702 |  | 4,004 |  |  |  |  |
Policy acquisition costs |  |  |  |  |  | (16) |  | (14) |  |  |  |  |
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 1,181 |  | 819 | 1,181 |  | 819 | 902 |  | 745 |  |
Future policy benefits |  | 2,569 | 4,072 |  | 4,335 | 4,072 |  | 4,335 |  |  |  |  |
Policy acquisition costs |  |  |  |  |  | (100) |  | (72) |  |  |  |  |
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 | 718 |  | 735 | 718 |  | 735 |  |  |  |  |
Insurance, Other | Segment Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred policy acquisition costs |  |  | 127 |  | 117 | 127 |  | 117 | 121 |  | $ 108 |  |
Future policy benefits |  | 89 | $ 670 |  | 92 | 670 |  | 92 |  |  |  |  |
Policy acquisition costs |  |  |  |  |  | $ (15) |  | (16) |  |  |  |  |
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 |  |  |  |  | (12,020) |  |  | (31,521) |  |  |  |  |
Net premiums earned |  |  |  |  | (11,535) |  |  | (29,838) |  |  |  |  |
Net realized (gains) losses |  |  |  |  | 384 |  |  | 787 |  |  |  |  |
Market risk benefits gains (losses) |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Losses and loss expenses |  |  |  |  | (7,279) |  |  | (17,474) |  |  |  |  |
Policy benefits |  |  |  |  | (486) |  |  | (790) |  |  |  |  |
Policy acquisition costs |  |  |  |  | (1,975) |  |  | (5,451) |  |  |  |  |
Other (income) expense |  |  |  |  | 188 |  |  | (21) |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  | (265) |  |  | (913) |  |  |  |  |
Net income (loss) |  |  |  |  | (812) |  |  | (4,001) |  |  |  |  |
Current discount rate on future policy benefits |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Instrument-specific credit risk on market risk benefits |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  |  |  | (165) |  |  | (1,222) |  |  |  |  |
Comprehensive income (loss) |  |  |  |  | (3,093) |  |  | (8,529) |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  | 8,592 |  |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  | (2,722) |  |  |  |  |
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 |  |  |  |  | (8) |  |  | (27) |  |  |  |  |
Net premiums earned |  |  |  |  | (5) |  |  | (22) |  |  |  |  |
Net realized (gains) losses |  |  |  |  | (72) |  |  | (149) |  |  |  |  |
Market risk benefits gains (losses) |  |  |  |  | 69 |  |  | 85 |  |  |  |  |
Losses and loss expenses |  |  |  |  | (216) |  |  | (641) |  |  |  |  |
Policy benefits |  |  |  |  | 221 |  |  | 651 |  |  |  |  |
Policy acquisition costs |  |  |  |  | (5) |  |  | (36) |  |  |  |  |
Other (income) expense |  |  |  |  | 14 |  |  | 12 |  |  |  |  |
Income Tax (Expense) Benefit |  |  |  |  | (2) |  |  | (6) |  |  |  |  |
Net income (loss) |  |  |  |  | (20) |  |  | (66) |  |  |  |  |
Current discount rate on future policy benefits |  |  |  |  | 479 |  |  | 1,546 |  |  |  |  |
Instrument-specific credit risk on market risk benefits |  |  |  |  | 8 |  |  | 48 |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  |  |  | 56 |  |  | 151 |  |  |  |  |
Comprehensive income (loss) |  |  |  |  | $ 435 |  |  | 1,422 |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  | 8 |  |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  | $ (8) |  |  |  |  |
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] | Net of valuation allowance for uncollectible reinsurance.
[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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- Definition Amount of investment in equity method investee and investment in and advance to affiliate + References No definition available. + Details
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- Definition The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated policy benefits net of any related valuation allowance. + References No definition available. + Details
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Namespace Prefix: | cb_
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