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STATEMENTS OF FINANCIAL POSITION (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Treasury stock (in shares) 22,110,132 22,110,132
Class A    
Common stock, stated value per share (in dollars per share) $ 0.0292 $ 0.0292
Common stock, authorized (in shares) 74,996,930 74,996,930
Common stock, issued (in shares) 68,299,200 68,299,200
Common stock, outstanding (in shares) 46,189,068 46,189,068
Class B    
Common stock, stated value per share (in dollars per share) $ 70 $ 70
Common stock, authorized (in shares) 3,070 3,070
Common stock, issued (in shares) 2,542 2,542
Common stock, outstanding (in shares) 2,542 2,542
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent) 2400.00% 2400.00%