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Balance Sheets (Unaudited) - MEC (Parenthetical) - $ / shares
shares in Millions
Mar. 31, 2022
Dec. 31, 2021
Common stock, shares authorized 115 115
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 76 76
Common stock, shares outstanding 76 76
MEC    
Common stock, shares authorized 350 350
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 71 71
Common stock, shares outstanding 71 71