Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Details)

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Assets And Liabilities Measured At Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 449 $ 507
Short term marketable securities 51 199
Available-for-sale securities 604 769
Financial instrument assets 305 305
Debt 941 990
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 449 507
Available-for-sale securities 554 691
Financial instrument assets 134 96
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short term marketable securities 51 199
Available-for-sale securities 50 78
Financial instrument assets 171 209
Debt $ 941 $ 990