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Marketable Securities - Additional Information (Detail) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 USD ($) Investment Y | Dec. 31, 2011 USD ($) | Dec. 31, 2011 EUR (€) | Dec. 31, 2010 USD ($) | Dec. 31, 2011 Debt securities issued by foreign governments [Member] USD ($) | Dec. 31, 2010 Debt securities issued by foreign governments [Member] USD ($) | Dec. 31, 2012 Moody's, Aaa Rating [Member] USD ($) | Dec. 31, 2011 Moody's, Aaa Rating [Member] USD ($) | Dec. 31, 2011 A2 by Moody's [Member] Debt securities issued by foreign governments [Member] USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |  |  |  |
Italian Treasury Bills | $ 238 | $ 413 |  | $ 1,124 | $ 81 | $ 213 | $ 150 | $ 100 | $ 81
Minimum duration of government debt securities portfolio | 5 months |  |  |  |  |  |  |  |
Investment positions in floating-rate notes | 3 |  |  |  |  |  |  |  |
Number of Unrealized loss position in unrealized loss position | 3 |  |  |  |  |  |  |  |
Duration of the floating rate note portfolio | 1 |  |  |  |  |  |  |  |
Aggregate amortized cost basis of securities | 89 | 252 |  |  |  |  |  |  |
Pre-tax unrealized loss | 1 |  |  |  |  |  |  |  |
Senior unsecured bonds issued |  | 5 |  |  |  |  |  |  |
Original investment of senior unsecured bonds |  |  | 15 |  |  |  |  |  |
Cash proceeds from sale of senior unsecured bonds | 5 |  |  |  |  |  |  |  |
Fixed rate debt securities |  | $ 27 |  |  |  |  |  |  |

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