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Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | $ 672 | $ 570 | $ 492
Income tax expense | 511 | 1,239 | 1,269
Net income attributable to Chubb | 9,028 | 5,246 | 8,525
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income attributable to Chubb | (401) | (797) | 9
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment | (500) | (1,049) | 3
Income tax expense | 62 | 170 | 6
Net income attributable to Chubb | (438) | (879) | 9
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cumulative Translation Adjustment |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense | 13 | 4 | 0
Income tax expense | (3) | (1) | 0
Net income attributable to Chubb | 10 | 3 | 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Foreign Currency Transaction Gain (Loss), Realized | 50 | 105 | 0
Interest expense | (16) | (5) | 0
Income tax expense | (7) | (21) | 0
Net income attributable to Chubb | $ 27 | $ 79 | $ 0

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