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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 30, 2012
Subsequent Events [Abstract]
Gain on discontinued operations, after taxes	$ 11

Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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