Earnings per Share - Computation of Earnings per Share (EPS) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Earnings Per Share [Abstract] | ||||||||||
| Net income (loss) | $ 2,258 | $ 2,272 | $ 259 | |||||||
| Less: Net income (loss) attributable to non-controlling interests | 50 | 57 | 59 | |||||||
| Net income (loss) attributable to stockholders | $ 2,208 | $ 2,215 | $ 200 | |||||||
| Weighted average number of shares outstanding (after deduction of treasury shares) during the year | 325,781 | 338,646 | 338,477 | |||||||
| Plus incremental shares from assumed conversion of: | ||||||||||
| Options | [1] | 1,145 | 4,517 | 5,582 | ||||||
| Restricted Share Units, Performance Share Units and Equity Rights | [2] | 1,680 | 2,639 | 3,548 | ||||||
| Warrants | [3] | 0 | 0 | 0 | ||||||
| Dilutive potential common share | 2,825 | 7,156 | 9,130 | |||||||
| Adjusted weighted average number of shares outstanding (after deduction of treasury shares) during the year | [1] | 328,606 | 345,802 | 347,607 | ||||||
| Basic net income (loss) | $ 6.78 | $ 6.54 | $ 0.59 | |||||||
| Diluted net income (loss) | $ 6.72 | $ 6.41 | $ 0.58 | |||||||
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