Investments (Details 2) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Available-for-sale securities, by type
Available-for-sale Securities, Amortized Cost Basis	$ 1,025	$ 223
Available-for-sale Securities Unrealized Gains, Gross	271	267
Available-for-sale Securities Unrealized Losses, Gross	(13)	(5)
Available-for-sale securities, estimated fair value, total	1,283	485
Available-for-sale Securities and Cost Method Investments	1,264	631
Equity Securities
Available-for-sale securities, by type
Available-for-sale Securities, Amortized Cost Basis	940	209
Available-for-sale Securities Unrealized Gains, Gross	270	267
Available-for-sale Securities Unrealized Losses, Gross	(12)	(5)
Available-for-sale securities, estimated fair value, total	1,198	471
Other securities
Available-for-sale securities, by type
Available-for-sale Securities, Amortized Cost Basis	85	14
Available-for-sale Securities Unrealized Gains, Gross	1	0
Available-for-sale Securities Unrealized Losses, Gross	(1)	0
Available-for-sale securities, estimated fair value, total	$ 85	$ 14

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ Details