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Summary of significant accounting policies (Narrative) (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 01, 2023 | Jul. 01, 2022 | Jan. 01, 2021 | Dec. 31, 2020
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  | $ 8,259 |  | $ 7,339 | $ 6,758 |  |  |  |  |
Recoverable from unrated reinsurers, ceded reserve, default factor (percent) |  |  | 34.00% |  |  |  |  |  |  |  |
Percentage of fair value of loaned securities |  |  | 102.00% |  |  |  |  |  |  |  |
Quality assessment threshold used in goodwill impairment testing |  |  | 50.00% |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net |  | $ 2,400 | $ 2,900 |  | 2,400 |  |  |  |  |  |
Net operating results of ESIS included within Administrative expenses |  |  | (2) |  | 12 | 25 |  |  |  |  |
Cigna integration expenses |  |  | 69 |  | 48 | 0 |  |  |  |  |
Net income attributable to Chubb |  |  | 9,028 |  | 5,246 | 8,525 |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  | 12,404 |  | (3,865) | 6,384 |  |  |  |  |
Retained earnings |  | 48,305 | 54,810 |  | 48,305 |  |  |  |  |  |
Accumulated other comprehensive income |  | (10,185) | (6,809) |  | (10,185) |  |  |  |  |  |
Stockholders' Equity |  | (50,519) | (59,507) |  | (50,519) | (58,328) |  |  |  |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | [1] | (18,859) | (19,952) |  | (18,859) |  |  |  |  |  |
Reinsurance Recoverable Future Policy Benefits | [1] | (302) | (280) |  | (302) |  |  |  |  |  |
Deferred policy acquisition costs |  | 6,031 | 7,152 |  | 6,031 |  |  |  |  |  |
Value of business acquired |  | 3,702 | 3,674 |  | 3,702 | 235 |  |  |  | $ 263 |
Goodwill |  | 16,228 | 19,686 | [2] | 16,228 | 15,213 |  |  |  |  |
Prepaid Reinsurance Premiums |  | (3,136) | (3,221) |  | (3,136) |  |  |  |  |  |
Investments in partially-owned insurance companies |  | (2,507) | (191) |  | (2,507) |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense |  | (75,747) | (80,122) |  | (75,747) | (72,330) |  |  |  | (67,192) |
Unearned Premiums |  | (19,713) | (22,051) |  | (19,713) |  |  |  |  |  |
Future policy benefits |  | 10,476 | 13,888 |  | 10,476 | 7,837 |  |  | $ 7,652 |  |
Market risk benefits |  | 800 | 771 |  | 800 |  |  |  |  |  |
Reinsurance Payable |  | (7,780) | (8,302) |  | (7,780) |  |  |  |  |  |
Deferred tax liabilities |  | 377 | 1,555 |  | 377 |  |  |  |  |  |
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) |  |  |  |  |
Liability for Future Policy Benefits, Period Expense (Income) |  |  | (3,628) |  | (2,314) | (1,740) |  |  |  |  |
Other (income) expense |  |  | (836) |  | 89 | (2,367) |  |  |  |  |
Income Tax Expense (Benefit) |  |  | (511) |  | (1,239) | (1,269) |  |  |  |  |
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 |  |  |  |  |
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) |  |  |  |  |
Huatai Group [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  | 76.50% |  |  |  | 69.60% |  |  |  |
Previously Reported |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | 7,392 | 6,918 |  |  |  |  |
Net income attributable to Chubb |  |  |  |  | 5,313 | 8,539 |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  | (5,230) | 6,020 |  |  |  |  |
Retained earnings |  | 48,334 |  |  | 48,334 |  |  |  |  |  |
Accumulated other comprehensive income |  | (10,193) |  |  | (10,193) |  |  |  |  |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments |  | (18,901) |  |  | (18,901) |  |  |  |  |  |
Reinsurance Recoverable Future Policy Benefits |  | (303) |  |  | (303) |  |  |  |  |  |
Deferred policy acquisition costs |  | 5,788 |  |  | 5,788 |  |  |  |  |  |
Value of business acquired |  | 3,596 |  |  | 3,596 |  |  |  |  |  |
Prepaid Reinsurance Premiums |  | (3,140) |  |  | (3,140) |  |  |  |  |  |
Investments in partially-owned insurance companies |  | (2,877) |  |  | (2,877) |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense |  | (76,323) |  |  | (76,323) |  |  |  |  |  |
Unearned Premiums |  | (20,360) |  |  | (20,360) |  |  |  |  |  |
Future policy benefits |  | 10,120 |  |  | 10,120 |  |  |  |  | $ 6,065 | [3]
Market risk benefits |  | 0 |  |  | 0 |  |  |  |  |  |
Reinsurance Payable |  | (7,795) |  |  | (7,795) |  |  |  |  |  |
Deferred tax liabilities |  | 292 |  |  | 292 |  |  |  |  |  |
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) |  |  |  |  |
Liability for Future Policy Benefits, Period Expense (Income) |  |  |  |  | (1,492) | (699) |  |  |  |  |
Other (income) expense |  |  |  |  | 74 | (2,365) |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | (1,255) | (1,277) |  |  |  |  |
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) |  |  |  |  |
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) |  |  |  |  |
Effect of Modified Retrospective Application Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Costs, Amortization Expense |  |  |  |  | 53 | 160 |  |  |  |  |
Net income attributable to Chubb |  |  |  |  | 67 | 14 |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  | 1,365 | 364 |  |  |  |  |
Retained earnings |  | 29 |  |  | 29 |  |  |  | 52 |  |
Accumulated other comprehensive income |  | 8 |  |  | 8 |  |  |  | $ 1,800 |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments |  | (42) |  |  | (42) |  |  |  |  |  |
Reinsurance Recoverable Future Policy Benefits |  | (1) |  |  | (1) |  |  |  |  |  |
Deferred policy acquisition costs |  | 243 |  |  | 243 |  |  |  |  |  |
Value of business acquired |  | 106 |  |  | 106 |  |  |  |  |  |
Prepaid Reinsurance Premiums |  | (4) |  |  | (4) |  |  |  |  |  |
Investments in partially-owned insurance companies |  | (370) |  |  | (370) |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense |  | (576) |  |  | (576) |  |  |  |  |  |
Unearned Premiums |  | (647) |  |  | (647) |  |  |  |  |  |
Future policy benefits |  | 356 |  |  | 356 |  |  |  |  |  |
Market risk benefits |  | 800 |  |  | 800 |  |  |  |  |  |
Reinsurance Payable |  | (15) |  |  | (15) |  |  |  |  |  |
Deferred tax liabilities |  | 85 |  |  | 85 |  |  |  |  |  |
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) |  |  |  |  |
Liability for Future Policy Benefits, Period Expense (Income) |  |  |  |  | 822 | 1,041 |  |  |  |  |
Other (income) expense |  |  |  |  | 15 | (2) |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  | (16) | (8) |  |  |  |  |
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 |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Total |  |  |  |  | 15 | 2 |  |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  | (15) | $ (2) |  |  |  |  |
Cigna's Life Insurance Business in Asian Markets |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Chubb |  | 140 |  |  |  |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |  |  | $ (5,380) |  |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments |  |  |  |  |  |  |  | (3) |  |  |
Reinsurance Recoverable Future Policy Benefits |  |  |  |  |  |  |  | (85) |  |  |
Value of business acquired |  |  |  |  |  |  |  | 3,633 |  |  |
Goodwill |  |  |  |  |  |  |  | 1,189 |  |  |
Liability for Claims and Claims Adjustment Expense |  |  |  |  |  |  |  | (12) |  |  |
Unearned Premiums |  |  |  |  |  |  |  | (61) |  |  |
Future policy benefits |  |  |  |  |  |  |  | 3,856 |  |  |
Reinsurance Payable |  |  |  |  |  |  |  | (115) |  |  |
Deferred tax liabilities |  |  |  |  |  |  |  | $ 887 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums, Amortization Period |  |  | 1 year |  |  |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Accrued Interest, Threshold Period, Writeoff |  |  | 30 days |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance Premiums, Amortization Period |  |  | 3 years |  |  |  |  |  |  |  |
Affiliated notional cash pooling program |  |  | $ 300 |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 25 years |  |  |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Accrued Interest, Threshold Period, Writeoff |  |  | 45 days |  |  |  |  |  |  |  |
Fair Value Adjustment to Acquired Loss Reserves [Member] | The Chubb Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance of FV adjustment on Unpaid Losses and Loss Expenses |  | $ 74 | $ 62 |  | $ 74 |  |  |  |  |  |
Software Development [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  | $ 1,700 |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 15 years |  |  |  |  |  |  |  |
Software Development [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |  |  |  |  |  |  |  |
Software Development [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 5 years |  |  |  |  |  |  |  |
Building [Member] |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Net |  |  | $ 510 |  |  |  |  |  |  |  |
Building [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 40 years |  |  |  |  |  |  |  |
[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.

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