Earnings (Loss) Per Share (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding stock awards excluded from calculation of diluted earnings per share		18
Outstanding Stock Awards and Common Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding stock awards excluded from calculation of diluted earnings per share	25
Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding stock awards excluded from calculation of diluted earnings per share	4