Stockholders' Equity and Earnings per Share - Computation of Earnings per Share (EPS) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings per share data:
Net income (loss)	$ 272	$ 2,258	$ 2,272
Less: Net income (loss) attributable to non-controlling interests	29	50	57
Net income (loss) attributable to stockholders	$ 243	$ 2,208	$ 2,215
Weighted average number of shares outstanding (after deduction of treasury shares) during the year (in shares)	282,056	325,781	338,646
Plus incremental shares from assumed conversion of:
Options (in shares)	776	1,145	4,517
Restricted Share Units, Performance Share Units and Equity Rights (in shares)	3,079	1,680	2,639
Warrants (in shares)	0	0	0
Dilutive potential common share (in shares)	3,855	2,825	7,156
Adjusted weighted average number of shares outstanding (after deduction of treasury shares) during the year (in shares)	285,911	328,606	345,802
Basic net income (loss) (in dollars per share)	$ 0.86	$ 6.78	$ 6.54
Diluted net income (loss) (in dollars per share)	0.85	$ 6.72	$ 6.41
Exercise price of warrants (in dollars per share)	$ 130.99
Maximum | Stock Options
Plus incremental shares from assumed conversion of:
Antidilutive securities excluded from computation of earnings per share (in shares)	100	100	100
Maximum | Unvested RSU's, PSU's and Equity Rights
Plus incremental shares from assumed conversion of:
Antidilutive securities excluded from computation of earnings per share (in shares)	700	900	700
Maximum | Warrant
Plus incremental shares from assumed conversion of:
Antidilutive securities excluded from computation of earnings per share (in shares)	11,400	11,200	11,200
Common stock
Plus incremental shares from assumed conversion of:
Exercise price of warrants (in dollars per share)	$ 130.99	$ 132.55	$ 133.32