$\backslash$table$[[$Merck & Co$.,$ Inc. Stockholders' Equity $($$ millions$),$Year,Year$],[$Common stock, $$0\mathrm{.}50$ par value,,$],[$Authorized$-6,500,000,000$ shares,,$],[$Issued$-3,688,014,021$ shares in current and prior year,$$1,844,$$$1,844$