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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Available-for-sale investments, cost basis $ 113 $ 78
Available-for-sale investments, fair value $ 109 $ 81