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Investments (Details Textuals 16) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investments [Abstract]
Gains (losses) from foreign currency transactions	$ (112)	$ 37	$ 230

- Definition

The net realized foreign currency transaction gain (loss) (pretax) included in determining net income from transactions that were settled as of the balance sheet date.

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