Quarterly report pursuant to Section 13 or 15(d)

Short-Term And Long-Term Investments And Restricted Deposits (Narrative) (Details)

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Short-Term And Long-Term Investments And Restricted Deposits (Narrative) (Details) - Jun. 30, 2015
$ in Millions
USD ($)
positions
Investments, Debt and Equity Securities [Abstract]  
Percentage of investments in securities recorded at fair value that carry a rating by Moody's or S&P of AAA/Aaa 48.00%
Percentage of investments in securities recorded at fair value that carry a rating by Moody's or S&P of AA-/Aa3 or higher 66.00%
Percentage of investments in securities recorded at fair value that carry a rating by Moody's or S&P of A-/A3 or higher 90.00%
Positions from which gross unrealized losses were generated 122
Total unrealized investment positions 357
Income from equity method investments | $ $ 4