CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income (loss)	$ 1,221	$ (124)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Stock-based compensation	30	20
Depreciation and amortization	15	7
Amortization/accretion of investments	5	1
Deferred income taxes	(50)	0
Changes in assets and liabilities:
Accounts receivable	(1,819)	(2)
Prepaid expenses and other assets	(12)	(4)
Inventory	(448)	0
Right-of-use assets, operating leases	2	(14)
Accounts payable	(15)	2
Accrued liabilities	285	(12)
Deferred revenue	3,666	(1)
Operating lease liabilities	(2)	15
Other liabilities	93	6
Net cash provided by (used in) operating activities	2,971	(106)
Investing activities
Purchases of marketable securities	(726)	(621)
Proceeds from maturities of marketable securities	339	269
Proceeds from sales of marketable securities	242	42
Purchases of property and equipment	(35)	(6)
Net cash used in investing activities	(180)	(316)
Financing activities
Proceeds from public offerings of common stock, net of issuance costs	0	550
Proceeds from issuance of common stock through equity plans, net	28	28
Changes in financing lease liabilities	(2)	0
Net cash provided by financing activities	26	578
Net increase in cash, cash equivalents and restricted cash	2,817	156
Cash, cash equivalents and restricted cash, beginning of year	2,636	248
Cash, cash equivalents and restricted cash, end of period	5,453	404
Non-cash investing and financing activities
Purchases of property and equipment included in accounts payable and accrued liabilities	21	7
Right-of-use assets obtained through finance lease modifications and reassessments	$ 51	$ 0