Earnings 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
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income (loss)	$ 1,221	$ (124)
Denominator:
Basic weighted-average common shares outstanding (in shares)	400	353
Effect of dilutive securities (in shares)	30	0
Diluted weighted-average common shares outstanding (in shares)	430	353
Basic EPS (usd per share)	$ 3.05	$ (0.35)
Diluted EPS (usd per share)	$ 2.84	$ (0.35)