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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions | Total | Common Shares | Treasury Stock, Common | Additional Paid-in Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ 0
Balance – beginning of year, net of tax at Dec. 31, 2020 |  | $ 11,064 | $ (3,644) | $ 9,815 | $ 39,337 | $ 52 | $ 39,389 | $ 2,869 | $ (1,802) | $ 1,067 |
CB_Par Value Reduction |  | 0 |  | 0 |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  | (79) | 590 |  | (511) |  |  |  |  |  |
Common Shares repurchased |  |  | (4,861) |  |  |  |  |  |  |  |
Net shares issued under employee share-based compensation plans |  |  | 451 | (179) |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  | (52) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 286 |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  | 0 |  |  |  |  |  |  |
FundingDividendsDeclaredToRetainedEarnings |  |  |  | (1,392) |  |  |  |  |  |  |
Net income attributable to Chubb | $ 8,525 |  |  |  | 8,525 |  |  |  |  |  |
Funding Dividends Declared From Additional Paid In Capital |  |  |  |  | 1,392 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,392) |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (2,141) |  |  |  |  |  |  | (2,141) |  |  |
Balance – end of year, net of tax at Dec. 31, 2021 | 58,328 | 10,985 | (7,464) | 8,478 | 47,403 | 0 | 47,403 | (1,074) | 0 | (1,074) |
Net loss attributable to noncontrolling interests | 0 |  |  |  |  |  |  |  |  |  | 0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 0
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  |  |  |  |  |  |  |  | 0
Total shareholders’ equity | 58,328 |  |  |  |  |  |  |  |  |  |
CB_Par Value Reduction |  | 0 |  | 0 |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  | (639) | 4,983 |  | (4,344) |  |  |  |  |  |
Common Shares repurchased |  |  | (3,014) |  |  |  |  |  |  |  |
Net shares issued under employee share-based compensation plans |  |  | 382 | (173) |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  | (43) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 283 |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  | 0 |  |  |  |  |  |  |
FundingDividendsDeclaredToRetainedEarnings |  |  |  | (1,379) |  |  |  |  |  |  |
Net income attributable to Chubb | 5,246 |  |  |  | 5,246 |  |  |  |  |  |
Funding Dividends Declared From Additional Paid In Capital |  |  |  |  | 1,379 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,379) |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (9,111) |  |  |  |  |  |  | (9,111) |  |  |
Balance – end of year, net of tax at Dec. 31, 2022 | 50,519 | 10,346 | (5,113) | 7,166 | 48,305 | $ 0 | $ 48,305 | (10,185) | $ 0 | $ (10,185) |
Net loss attributable to noncontrolling interests | 0 |  |  |  |  |  |  |  |  |  | 0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | 0
Noncontrolling interests | 0 |  |  |  |  |  |  |  |  |  | 0
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  |  |  |  |  |  |  |  | 0
Total shareholders’ equity | 50,519 |  |  |  |  |  |  |  |  |  |
CB_Par Value Reduction |  | (9,759) |  | 9,759 |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  | (346) | 2,869 |  | (2,523) |  |  |  |  |  |
Common Shares repurchased |  |  | (2,478) |  |  |  |  |  |  |  |
Net shares issued under employee share-based compensation plans |  |  | 322 | (192) |  |  |  |  |  |  |
Stock Issued During Period, Value, Stock Options Exercised |  |  |  | (20) |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 322 |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  | 31 |  |  |  |  |  |  |
FundingDividendsDeclaredToRetainedEarnings |  |  |  | (1,401) |  |  |  |  |  |  |
Net income attributable to Chubb | 9,028 |  |  |  | 9,028 |  |  |  |  |  |
Funding Dividends Declared From Additional Paid In Capital |  |  |  |  | 1,401 |  |  |  |  |  |
Dividends declared on Common Shares |  |  |  |  | (1,401) |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 3,361 |  |  |  |  |  |  | 3,376 |  |  |
Balance – end of year, net of tax at Dec. 31, 2023 | 59,507 | $ 241 | $ (4,400) | $ 15,665 | $ 54,810 |  |  | $ (6,809) |  |  |
Net loss attributable to noncontrolling interests | (13) |  |  |  |  |  |  |  |  |  | (13)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  | (15)
Noncontrolling interests | 4,184 |  |  |  |  |  |  |  |  |  | 4,184
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  |  |  |  |  |  |  |  | $ 4,212
Total shareholders’ equity | $ 63,691 |  |  |  |  |  |  |  |  |  |

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