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Intangible Assets (Estimated Amortization Expense Over Next Five Years) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
2022, Other intangible assets | $ 281 |
2023, Other intangible assets | 265 |
2024, Other intangible assets | 242 |
2025, Other intangible assets | 225 |
2026, Other intangible assets | 209 |
Total, Other intangible assets | 1,222 |
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2022, Other intangible assets | 99 |
2023, Other intangible assets | 94 |
2024, Other intangible assets | 88 |
2025, Other intangible assets | 87 |
2026, Other intangible assets | 85 |
Total, Other intangible assets | 453 |
The Chubb Corporation [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2022, Other intangible assets | 182 |
2023, Other intangible assets | 171 |
2024, Other intangible assets | 154 |
2025, Other intangible assets | 138 |
2026, Other intangible assets | 124 |
Total, Other intangible assets | 769 |
The Chubb Corporation [Member] | Agency distribution relationships and renewal rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2022, Other intangible assets | 196 |
2023, Other intangible assets | 177 |
2024, Other intangible assets | 160 |
2025, Other intangible assets | 144 |
2026, Other intangible assets | 130 |
Total, Other intangible assets | 807 |
The Chubb Corporation [Member] | Fair Value Adjustment to Acquired Loss Reserves [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2022, Other intangible assets | (14) |
2023, Other intangible assets | (6) |
2024, Other intangible assets | (6) |
2025, Other intangible assets | (6) |
2026, Other intangible assets | (6) |
Total, Other intangible assets | (38) |
Balance of FV adjustment on Unpaid Losses and Loss Expenses | $ 90 | $ 110

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