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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Preferred stock, shares authorized (in shares) 25,000,000 25,000,000
Preferred stock, issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,800,000,000 1,800,000,000
Common stock, shares issued (in shares) 784,000,000 789,000,000
Treasury stock, shares (in shares) 134,000,000 121,000,000