Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Par value (in dollars per share) $ 0.001           $ 0.001  
Other comprehensive loss, tax $ (15) $ 19 $ (49) $ 13 $ 76 $ (40)    
Common Stock                
Par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 0.001 $ 0.001
Treasury Stock                
Par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001