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Condensed Financial Statements of Parent Company Condensed Balance Sheets (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Land, building and equipment, accumulated depreciation	$ 376	$ 352
Cincinnati Financial Corporation
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Land, building and equipment, accumulated depreciation	$ 94	$ 77

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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