Quarterly report pursuant to Section 13 or 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
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 719 $ 625
Available-for-sale securities 2,264 1,846
Investments in and Advances to Affiliates, at Fair Value 3,703 3,161
Debt 1,799 1,667
Fair Value, Inputs (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 719 625
Available-for-sale securities 2,264 1,846
Investments in and Advances to Affiliates, at Fair Value 3,703 3,161
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt $ 1,799 $ 1,667