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Annual report pursuant to Section 13 and 15(d)

Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)

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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý
Cash equivalents $ 625 $ 2,225
Short term marketable securities Ìý 910
Available-for-sale securities 1,846 1,294
Investments in and Advances to Affiliates, at Fair Value 3,161 Ìý
Debt 1,667 2,480
Fair Value, Inputs (Level 1) Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý
Cash equivalents 625 2,225
Short term marketable securities Ìý 331
Available-for-sale securities 1,846 1,287
Investments in and Advances to Affiliates, at Fair Value 3,161 Ìý
Significant Other Observable Inputs (Level 2) Ìý Ìý
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Ìý Ìý
Short term marketable securities Ìý 579
Available-for-sale securities Ìý 7
Debt $ 1,667 $ 2,480