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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2011 New York Life Korea And Hong Kong [Member]	Nov. 30, 2011 Penn Millers Holding Corporation [Member] state
Noncash or Part Noncash Acquisitions [Line Items]
Acquisition purchase price	$ 450	$ 107
Goodwill generated in acquisitions	91
Goodwill expected to be deductible for income tax	0
Other intangible assets generated in acquisition	$ 163
Number of states with operating facilities		34

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

The amount of identifiable intangible assets recognized as of the acquisition date.