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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |
Proceeds from sale of available-for-sale securities | $ 399 | $ 380
Number of securities with unrealized gross losses | 130 | 89

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