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Available-For-Sale Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Available-For-Sale Investments [Abstract]
Impairment loss for securities that have credit losses	$ 15		$ 18
Proceeds from sales and maturities of short-term investments	$ 341	$ 903

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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