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Statements of Consolidated Equity (Shares) - shares
shares in Thousands
Total
Preferred Stock
Common Stock
Treasury Stock
Beginning balance at Dec. 31, 2018 372,363 420 376,326 (3,963)
Issued:        
Stock Issued During Period, Shares, Other 0 20 0 0
Employee stock purchase plan 153 0 153 0
Long-term incentive plan 465 0 465 0
401(k) and profit sharing 466 0 466 0
Ending balance at Sep. 30, 2019 373,447 440 377,410 (3,963)
Beginning balance at Jun. 30, 2019 373,249 440 377,212 (3,963)
Issued:        
Employee stock purchase plan 51 0 51 0
Long-term incentive plan 1 0 1 0
401(k) and profit sharing 146 0 146 0
Ending balance at Sep. 30, 2019 373,447 440 377,410 (3,963)
Beginning balance at Dec. 31, 2019 382,136 440 386,099 (3,963)
Issued:        
Employee stock purchase plan 171 0 171 0
Long-term incentive plan 381 0 381 0
401(k) and profit sharing 426 0 426 0
Ending balance at Sep. 30, 2020 383,114 440 387,077 (3,963)
Beginning balance at Jun. 30, 2020 382,917 440 386,880 (3,963)
Issued:        
Employee stock purchase plan 65 0 65 0
Long-term incentive plan 2 0 2 0
401(k) and profit sharing 130 0 130 0
Ending balance at Sep. 30, 2020 383,114 440 387,077 (3,963)