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Investments (Schedule Of Cost And Fair Value Of Equity Securities) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]    
Cost $ 841 $ 707
Gross unrealized appreciation 63 41
Gross unrealized depreciation (67) (4)
Fair value $ 837 $ 744