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Shareholders' equity note (Tables) | 12 Months Ended
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Dec. 31, 2023
Stockholders' Equity Note [Abstract] |
Dividends Declared [Table Text Block] | The following table presents dividend distributions per Common Share in Swiss francs (CHF) and U.S. dollars (USD):
| Year Ended December 31
|  |  | 2023 |  |  |  | 2022 |  |  |  | 2021
| CHF |  | USD |  | CHF |  | USD |  | CHF |  | USD
Total dividend distributions per common share | 3.05 |  |  | $ | 3.41 |  |  | 3.11 |  |  | $ | 3.29 |  |  | 2.88 |  |  | $ | 3.18 |
Schedule of changes in Common Shares issued and outstanding |
| Year Ended December 31
| 2023 |  | 2022 |  | 2021
Common Shares authorized and issued, beginning of year | 446,376,614 |  |  | 474,021,114 |  |  | 477,605,264 |
Cancellation of treasury shares | (14,925,028) |  |  | (27,644,500) |  |  | (3,584,150) |
Common Shares authorized and issued, end of year | 431,451,586 |  |  | 446,376,614 |  |  | 474,021,114 |
Common Shares in treasury, beginning of year (at cost) | (31,781,758) |  |  | (47,448,502) |  |  | (26,872,639) |
Net shares issued under employee share-based compensation plans | 2,500,381 |  |  | 2,947,272 |  |  | 3,484,487 |
Shares repurchased | (11,825,600) |  |  | (14,925,028) |  |  | (27,644,500) |
Cancellation of treasury shares | 14,925,028 |  |  | 27,644,500 |  |  | 3,584,150 |
Common Shares in treasury, end of year (at cost) | (26,181,949) |  |  | (31,781,758) |  |  | (47,448,502) |
Common Shares outstanding, end of year | 405,269,637 |  |  | 414,594,856 |  |  | 426,572,612 |
Share Repurchase Program [Table Text Block] | Share repurchases may be in the open market, in privately negotiated transactions, block trades, accelerated repurchases and through option or other forward transactions. The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorizations:
| Year Ended December 31 |  | January 1, 2024 through
(in millions of U.S. dollars, except share data) | 2023 |  | 2022 |  | 2021 |  | February 22, 2024
Number of shares repurchased | 11,825,600 |  |  | 14,925,028 |  |  | 27,644,500 |  |  | 269,450 |
Cost of shares repurchased | $ | 2,478 |  |  | $ | 3,014 |  |  | $ | 4,861 |  |  | $ | 67 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table presents changes in accumulated other comprehensive income (loss):
|  |  | As Adjusted
| Year Ended December 31
(in millions of U.S. dollars) | 2023 |  | 2022 |  | 2021
Accumulated other comprehensive income (loss) (AOCI) |  |  |  |  |
Net unrealized appreciation (depreciation) on investments |  |  |  |  |
Balance – beginning of year, net of tax | $ | (7,279) |  |  | $ | 2,256 |  |  | $ | 4,673 |
Change in year, before reclassification from AOCI (before tax) | 2,948 |  |  | (11,627) |  |  | (2,935) |
Amounts reclassified from AOCI (before tax) | 500 |  |  | 1,049 |  |  | (3) |
Change in year, before tax | 3,448 |  |  | (10,578) |  |  | (2,938) |
Income tax (expense) benefit | (328) |  |  | 1,043 |  |  | 521 |
Total other comprehensive income (loss) | 3,120 |  |  | (9,535) |  |  | (2,417) |
Noncontrolling interests, net of tax | 18 |  |  | — |  |  | — |
Balance – end of year, net of tax | (4,177) |  |  | (7,279) |  |  | 2,256 |
Current discount rate on liability for future policy benefits |  |  |  |  |
Balance – beginning of year, net of tax | (75) |  |  | (1,399) |  |  | — |
Cumulative effect of adoption of accounting guidance | — |  |  | — |  |  | (1,725) |
Balance – beginning of year, net of tax, as adjusted | (75) |  |  | (1,399) |  |  | (1,725) |
Change in year, before tax | 84 |  |  | 1,480 |  |  | 387 |
Income tax (expense) benefit | 16 |  |  | (156) |  |  | (61) |
Total other comprehensive income | 100 |  |  | 1,324 |  |  | 326 |
Noncontrolling interests, net of tax | (26) |  |  | — |  |  | — |
Balance – end of year, net of tax | 51 |  |  | (75) |  |  | (1,399) |
Instrument-specific credit risk on market risk benefits |  |  |  |  |
Balance – beginning of year, net of tax | (24) |  |  | (57) |  |  | — |
Cumulative effect of adoption of accounting guidance | — |  |  | — |  |  | (84) |
Balance – beginning of year, net of tax, as adjusted | (24) |  |  | (57) |  |  | (84) |
Change in year, before and net of tax | 2 |  |  | 33 |  |  | 27 |
Total other comprehensive income | 2 |  |  | 33 |  |  | 27 |
Noncontrolling interests, net of tax | — |  |  | — |  |  | — |
Balance – end of year, net of tax | (22) |  |  | (24) |  |  | (57) |
Cumulative foreign currency translation adjustment |  |  |  |  |
Balance – beginning of year, net of tax | (2,966) |  |  | (2,114) |  |  | (1,637) |
Cumulative effect of adoption of accounting guidance | — |  |  | — |  |  | 7 |
Balance – beginning of year, net of tax, as adjusted | (2,966) |  |  | (2,114) |  |  | (1,630) |
Change in year, before reclassification from AOCI (before tax) | — |  |  | (907) |  |  | (505) |
Amounts reclassified from AOCI (before tax) | (13) |  |  | (4) |  |  | — |
Change in year, before tax | (13) |  |  | (911) |  |  | (505) |
Income tax benefit | 27 |  |  | 59 |  |  | 21 |
|  |  |  |  | As Adjusted
| Year Ended December 31
(in millions of U.S. dollars) | 2023 |  | 2022 |  | 2021
Accumulated other comprehensive income (loss) (AOCI) - continued |  |  |  |  |
Total other comprehensive income (loss) | 14 |  |  | (852) |  |  | (484) |
Noncontrolling interests, net of tax | (7) |  |  | — |  |  | — |
Balance – end of year, net of tax | (2,945) |  |  | (2,966) |  |  | (2,114) |
Fair value hedging instruments |  |  |  |  |
Balance – beginning of year, net of tax | (66) |  |  | — |  |  | — |
Change in year, before reclassification from AOCI (before tax) | 101 |  |  | 17 |  |  | — |
Amounts reclassified from AOCI (before tax) | (34) |  |  | (100) |  |  | — |
Change in year, before tax | 67 |  |  | (83) |  |  | — |
Income tax (expense) benefit | (14) |  |  | 17 |  |  | — |
Total other comprehensive income (loss) | 53 |  |  | (66) |  |  | — |
Noncontrolling interests, net of tax | — |  |  | — |  |  | — |
Balance – end of year, net of tax | (13) |  |  | (66) |  |  | — |
Postretirement benefit liability adjustment |  |  |  |  |
Balance – beginning of year, net of tax | 225 |  |  | 240 |  |  | (167) |
Change in year, before tax | 90 |  |  | (17) |  |  | 522 |
Income tax (expense) benefit | (18) |  |  | 2 |  |  | (115) |
Total other comprehensive income (loss) | 72 |  |  | (15) |  |  | 407 |
Noncontrolling interests, net of tax | — |  |  | — |  |  | — |
Balance – end of year, net of tax | 297 |  |  | 225 |  |  | 240 |
Accumulated other comprehensive loss | $ | (6,809) |  |  | $ | (10,185) |  |  | $ | (1,074) |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The following table presents reclassifications from accumulated other comprehensive income (loss) to the consolidated statements of operations:
|  |  |  |  | Consolidated Statement of Operations Location
| Year Ended December 31 |
(in millions of U.S. dollars) | 2023 |  | 2022 |  | 2021 |
Fixed maturities available-for-sale | $ | (500) |  |  | $ | (1,049) |  |  | $ | 3 |  |  | Net realized gains (losses)
Income tax benefit | 62 |  |  | 170 |  |  | 6 |  |  | Income tax expense
| $ | (438) |  |  | $ | (879) |  |  | $ | 9 |  |  | Net income
Cumulative foreign currency translation adjustment |  |  |  |  |  |  |
Cross-currency swaps | $ | 13 |  |  | $ | 4 |  |  | $ | — |  |  | Interest expense
Income tax expense | (3) |  |  | (1) |  |  | — |  |  | Income tax expense
| $ | 10 |  |  | $ | 3 |  |  | $ | — |  |  | Net income
Net gains (losses) of fair value hedging instruments |  |  |  |  |  |  |
Cross-currency swaps | $ | 50 |  |  | $ | 105 |  |  | $ | — |  |  | Net realized gains (losses)
Cross-currency swaps | (16) |  |  | (5) |  |  | — |  |  | Interest expense
Income tax expense | (7) |  |  | (21) |  |  | — |  |  | Income tax expense
| $ | 27 |  |  | $ | 79 |  |  | $ | — |  |  | Net income
Total amounts reclassified from AOCI | $ | (401) |  |  | $ | (797) |  |  | $ | 9 |  |  |

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