Earnings (Loss) per Share - Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income (loss)	$ 3,333	$ (233)	$ 7,334	$ (474)
Denominator:
Basic weighted-average common shares outstanding (in shares)	404	395	402	376
Effect of dilutive securities (in shares)	30	0	29	0
Diluted weighted-average common shares outstanding (in shares)	434	395	431	376
Basic EPS (usd per share)	$ 8.27	$ (0.59)	$ 18.25	$ (1.26)
Diluted EPS (usd per share)	$ 7.70	$ (0.59)	$ 17.00	$ (1.26)