CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,221	$ (124)
Other comprehensive loss:
Unrealized loss on available-for-sale debt securities, net of tax of $0 and $0, for the three months ended March 31, 2021 and 2020, respectively	(2)	(8)
Comprehensive income (loss)	$ 1,219	$ (132)