Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details

Investments (Details Textuals 15) (USD $) In Millions	3 Months Ended		9 Months Ended
Investments (Details Textuals 15) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other investment portfolio gains (losses)	$ 0	$ (67)	$ (2)	$ 9
Goodwill Impairment Loss [Abstract]
Goodwill, Impairment Loss	65
Mitsui Sumitomo MetLife Insurance Co., LTD. ("MSI MetLife") [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other investment portfolio gains (losses)	$ 0		$ (87)