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Available-for-sale investments (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Available-for-sale investments (Textual) [Abstract]
Cash	$ 433		$ 370
Total realized gains	85	67
Total realized losses	$ 18	$ 19

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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