Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Cash Deposits Subject to Credit Risk (Detail)

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Fair Value Measurements - Schedule of Cash Deposits Subject to Credit Risk (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Cash Deposits (including restricted cash) $ 35 $ 70
Amount of Cash Deposits in excess of amounts federally insured $ 32 $ 66