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Stockholders' Equity - Common Share Repurchases and Issuances (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]      
Common stock repurchased 27,000,000 58,000,000 19,000,000
Average purchase price per share $ 22.26 $ 15.52 $ 15.77
Shares repurchased related to employee stock-based compensation plans 6,365,002 4,547,785 3,024,662
Average purchase price per share $ 21.76 $ 15.86 $ 15.71
Common shares issued 9,702,976 6,432,643 3,886,217
Common Stock [Member]
      
Equity, Class of Treasury Stock [Line Items]      
Common stock repurchased 26,987,043 58,038,239 19,054,115
Common shares issued 9,702,976 6,432,643 3,886,217