Consolidated Statements of Operations (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Individual Life [Member]	Sep. 30, 2012 Individual Life [Member]	Dec. 31, 2012 Individual Life [Member]
Goodwill impairment loss	$ 0	$ 0	$ 61	$ 0	$ 61

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