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Consolidated Balance Sheets - Westar Energy, Inc (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Common stock - shares authorized (in shares) 600,000,000 600,000,000
Common stock - shares issued (in shares) 244,838,786 255,326,252
Westar Energy    
Common stock - shares authorized (in shares) 1,000 1,000
Common stock - par value (in dollars per share) $ 0.01 $ 0.01
Common stock - shares issued (in shares) 1 1