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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jul. 31, 2007
Stockholders Equity [Line Items] |  |  |  |
Common stock outstanding under repurchase authorization | 24 |  |  | 50
Repurchase and retirement of common stock to offset the dilutive impact of long-term stock awards | 1 | 2 | 3 |
Repurchase and retirement of common stock cash aggregate to offset the dilutive effect | $ 8 | $ 30 | $ 45 |
Grant of long-term stock awards | 1 | 2 | 5 |
Cash dividends per common share paid | $ 0.30 | $ 0.30 | $ 0.30 |
Cash dividends per common share (declared) | $ 0.30 | $ 0.30 | $ 0.30 |
Income tax on unrealized loss on marketable securities | 14 | 14 |  |
Income tax on prior service cost and net loss | $ 109 | $ 100 |  |

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