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Statements of Consolidated Common Stockholders' Equity (Shares) (Parenthetical)
shares in Thousands
 3 Months Ended
Mar. 31, 2017
shares
Balance as of January 1, 2017 323,160
Treasury Stock acquired (184)
Issued:  
Employee stock purchase plan 49
Long-term incentive plan 763
401(k) and profit sharing 577
Dividend reinvestment plan 109
Balance as of March 31, 2017 324,474
Common Stock  
Balance as of January 1, 2017 326,664
Issued:  
Employee stock purchase plan 49
Long-term incentive plan 763
401(k) and profit sharing 577
Dividend reinvestment plan 109
Balance as of March 31, 2017 328,162
Treasury Stock  
Balance as of January 1, 2017 (3,504)
Treasury Stock acquired (184)
Issued:  
Employee stock purchase plan 0
Long-term incentive plan 0
401(k) and profit sharing 0
Dividend reinvestment plan 0
Balance as of March 31, 2017 (3,688)