Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic and diluted EPS:
Net loss	$ (1,635)	$ (1,250)
Basic weighted average common shares outstanding (in shares)	649,503	634,609
Basic EPS (in dollars per share)	$ (2.52)	$ (1.97)
PSP1 Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrants, number of warrant shares of common stock (in shares)	14,100
Exercise price of warrants (in dollars per share)	$ 12.51
Treasury Loan Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrants, number of warrant shares of common stock (in shares)	4,400
Exercise price of warrants (in dollars per share)	$ 12.51
PSP2 Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrants, number of warrant shares of common stock (in shares)	6,600
Exercise price of warrants (in dollars per share)	$ 15.66
6.50% convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	61,728	61,728
Restricted stock unit awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	3,933	3,255
Preferred Stock Purchase Rights | PSP1 Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	3,724	4,957
Preferred Stock Purchase Rights | Treasury Loan Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	1,161	1,545
Preferred Stock Purchase Rights | PSP2 Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	520	520