UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Accounts receivable, allowance for credit loss	$ 245	$ 49
Prepaid expense, allowance for credit loss	$ 54	$ 6
Common stock, par value (in dollars per share)	$ 0.008	$ 0.008
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	63,369,751	63,179,471
Treasury stock, shares (in shares)	22,439,549	21,762,070
Short-term Investments
Available-for-sale debt securities, amortized cost	$ 414	$ 998
Prepaid Expenses and Other Current Assets
Prepaid expense, allowance for credit loss	5	6
Long-term Investments
Available-for-sale debt securities, amortized cost	775	2,192
Other Assets [Member]
Prepaid expense, allowance for credit loss	$ 49	$ 0