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UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Amortized cost of available-for-sale debt securities, current $ 525 $ 500
Accounts receivable, allowance for expected credit losses 110 166
Prepaid expenses, allowance for expected credit losses, current 15 22
Amortized cost of available-for-sale debt securities, noncurrent 200 225
Other assets, allowance for expected credit losses, noncurrent $ 35 $ 33
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) 63,580,079 63,406,451
Treasury stock, shares (in shares) 22,516,608 22,446,897