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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2009 USD ($) $ / Right shares | Dec. 31, 2015 USD ($) | Jan. 31, 2016 USD ($) | Oct. 31, 2009 $ / shares shares
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 885 |  |  |  | $ 885 |  |
Stock Repurchased During Period, Shares | shares |  | 16,100,000 |  |  |  |  |  |
Stock Repurchased During Period, Value |  | $ 394 | $ 300 | $ 50 |  | 745 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 140 |  |  |  | 140 |  |
Convertible note hedge purchased, gross |  |  |  |  | $ 95 |  |  |
Proceeds from issuance of warrants |  |  |  |  | $ 62 |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares |  |  | 4,000,000 |  |  |  |  |
Common stock subject to anti-dilution provisions | shares |  |  |  |  | 21,200,000 |  |  |
Convertible note hedge strike price | $ / Right |  |  |  |  | 16.25 |  |  |
Repurchased warrants for the purchase of the Company's common stock | $ 41 | 0 | $ 0 | 78 |  |  |  |
Proceeds from Derivative Instrument, Financing Activities |  |  |  | 50 |  |  |  |
Proceeds from sale of convertible note hedge | $ 54 | 0 | 0 | 104 |  |  |  |
Adjustments to Treasury Stock, Other | shares | (179,000) |  |  |  |  |  |  |
Adjustment to Treasury Stock, Other | $ (7) |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  |  | 8 |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | 5 | 5 | 0 |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax |  | 5 | 3 | 15 |  |  |  |
Less: Pension and post-retirement benefits reclassified to earnings, net of tax of $(2), $(1) and $(6), respectively |  | (3) | (2) | $ (9) |  |  |  |
Three And One Over Two Senior Notes [Member] |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Change in net purchase and issuance of shares | shares |  |  |  | 13,000,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Repurchased warrants for the purchase of the Company's common stock |  |  |  | $ 37 |  |  |  |
Convertible Notes Payable [Member] | 3 1/2% Convertible Senior Notes |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  |  |  |  |  |  | $ 22.50
Long-term Debt, Gross |  |  | 66 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price Per $1,000 Principal | shares |  |  |  |  |  |  |  | 61.5385
Subsequent Event |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 300 |
Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net |  | $ 34 | $ 46 | $ (11) |  | $ 69 |  |

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