Quarterly report pursuant to Section 13 or 15(d)

Investments In Available-For-Sale Securities And Other Cost Investments (Unrealized Holding Gains And Losses) (Details)

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Investments In Available-For-Sale Securities And Other Cost Investments (Unrealized Holding Gains And Losses) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Gross unrealized holding gains | Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax $ 2 $ 6
Gross unrealized holding gains | Debt Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 0 1
Gross unrealized holding losses | Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 0 0
Gross unrealized holding losses | Debt Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax $ 0 $ 0