Stockholders' Equity - Schedule of Transactions from Employee Option and Share Plans (Detail) - USD ($) $ / shares in Units, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Equity [Abstract] | |||
| Total shares in treasury at beginning of year | 3,078,470 | 10,609,980 | 3,998,982 |
| Total cost | $ 342 | $ 915 | $ 342 |
| Shares acquired under repurchase program | 54,376,181 | 2,522,589 | 15,537,868 |
| Average price in $ per share | $ 92.07 | $ 113.36 | $ 82.36 |
| Amount paid | $ 5,006 | $ 286 | $ 1,280 |
| Shares delivered | 4,241,487 | 10,054,099 | 8,926,870 |
| Average price in $ per share | $ 107.75 | $ 85.42 | $ 79.25 |
| Amount received | $ 39 | $ 233 | $ 115 |
| Shares retired | 17,300,143 | 0 | 0 |
| Total shares in treasury at end of year | 35,913,021 | 3,078,470 | 10,609,980 |
| Total cost | $ 3,238 | $ 342 | $ 915 |
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- Definition Stock issued during period shares treasury stock delivered. No definition available.
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- Definition Stock Issued During Period Treasury Stock Reissued Average Cost Per Share No definition available.
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- References No definition available.
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- Definition The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The net cash inflow or outflow resulting from the entity's share transaction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of shares of common and preferred stock retired from treasury during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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