v3.20.4
Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 4,000,000,000 4,000,000,000
Common stock, issued (in shares) 1,792,140,764 1,781,582,608
Common stock held in treasury, at cost (in shares) 27,007,945 302,671,146