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Goodwill, Other intangible assets, and Value of business acquired (Estimated Amortization Expense Over Next Five Years) (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Finite-Lived Intangible Assets [Line Items] |  |
2023, Other intangible assets | $ 354 |
2024, Other intangible assets | 315 |
2025, Other intangible assets | 288 |
2026, Other intangible assets | 265 |
2027, Other intangible assets | 253 |
Total, Other intangible assets | 1,475 |
Chubb Acquired Purchased Intangible Assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
2023, Other intangible assets | 312 |
2024, Other intangible assets | 287 |
2025, Other intangible assets | 269 |
2026, Other intangible assets | 250 |
2027, Other intangible assets | 240 |
Total, Other intangible assets | 1,358 |
Use Rights [Member] | Huatai Group [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2023, Other intangible assets | 12 | [1]
2024, Other intangible assets | 12 | [1]
2025, Other intangible assets | 12 | [1]
2026, Other intangible assets | 12 | [1]
2027, Other intangible assets | 13 | [1]
Total, Other intangible assets | 61 | [1]
Unearned Premium Reserves Intangible Asset | Huatai Group [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
2023, Other intangible assets | 30 | [2]
2024, Other intangible assets | 16 | [2]
2025, Other intangible assets | 7 | [2]
2026, Other intangible assets | 3 | [2]
2027, Other intangible assets | 0 | [2]
Total, Other intangible assets | $ 56 | [2]
[1] | Recognized in Other (income) expense in the Consolidated statements of operations.
[2] | Recognized in Policy acquisition costs in the Consolidated statements of operations.

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