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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
shares in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]    
Shares purchased for tax withholding obligation (in shares) (9) (27)
Dividends per common share (in usd per share) $ 0.325 $ 0.30