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