Fair Value Measurements (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010 License agreements and other	Dec. 31, 2010 Game engines	Dec. 31, 2010 Internally developed franchises
Definite-Lived and Indefinite Lived Intangible Assets
Impairment charges		$ 67	$ 9	$ 250
Goodwill impairment	$ 12

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