Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net unrealized appreciation on investments
Net unrealized appreciation on investments, Change in year, income tax (expense) benefit	$ (198)	$ (157)	$ (152)
Cumulative Translation Adjustment
Cumulative translation adjustment, Change in year, income tax(expense) benefit	(35)	1	29
Accumulated Defined Benefit Plans Adjustment [Member]
Pension liability adjustment, Change in year, income tax (expense) benefit	$ 12	$ (3)	$ (4)

- Definition

Tax effect, net of reclassification adjustments, of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

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