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Assets And Liabilities Measured At Fair Value (Tables)

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Assets And Liabilities Measured At Fair Value (Tables)	9 Months Ended
	Sep. 30, 2013
Assets And Liabilities Measured At Fair Value	Ìý
Assets And Liabilities Measured At Fair Value On A Recurring Basis	èßäÉçÇø's assets and liabilities measured at fair value are as follows: Ìý Ìý Ìý Fair Value Measurements at September 30, 2013 Description Total Ìý Quoted prices in active markets for identical assets (LevelÌý1) Ìý Significant other observable inputs (LevelÌý2) Ìý Ìý Ìý amounts in millions Cash equivalents $ 367 Ìý 367 Ìý — Available-for-sale securities $ 1,244 Ìý 955 Ìý 289
Unrealized Gain (Loss) on Investments [Table Text Block]	Realized and unrealized gains (losses) on financial instruments are comprised of changes in the fair value of the following: Ìý Three months ended September 30, Ìý Nine months ended September 30, Ìý 2013 Ìý 2012 Ìý 2013 Ìý 2012 Ìý amounts in millions Fair Value Option Securities $ 53 Ìý 126 Ìý 189 Ìý 257 Other derivatives 11 Ìý 9 Ìý 33 Ìý (84 ) Ìý $