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Available-for-sale investments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Available-for-sale investments (Textual) [Abstract]
Cash	$ 370	$ 680
Total realized gains	186	191	115
Total realized losses	$ 54	$ 37	$ 25

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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