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Dividend restrictions - Insurance subsidiaries (Detail) (USD $) In Billions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Principal Insurance Subsidiaries [Member]
Statutory Accounting Practices [Line Items]
Amount available for payment of dividends without prior regulatory approval	$ 9.5
United States Based Property and Casualty Insurance Subsidiaries [Member]
Statutory Accounting Practices [Line Items]
Statutory shareholders' equity	$ 95	$ 94
Number of years for amortizing goodwill under statutory rules	10 years

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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