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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Parenthetical) (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Available-for-sale investments, cost basis $ 4 $ 4
Available-for-sale investments, fair value $ 4 $ 5