Ideas not included in the Declaration of Independence include the ideas outlined in the Constitution and Bill of Rights. It also did not include ideas congruent with the ideas of constitutional and absolute monarchy that existed in Europe at the time of American Independence.
Ideas not included in The Declaration of Independence (1776) include the ideas outlined in other important American documents it is often confused with such as the Constitution of the United States of America (1787) and the Bill of Rights (1791). Ideas expressed in these other documents that do not appear in the Declaration of Independence include the establishment of the Senate, the House of Representatives and the office of the President of the United States; the right to bear arms and to free speech; naturalization laws; freedom of religion; and separation of church and state. Aside from briefly citing "absolute Despotism" as the king's way of reducing his string of "abuses and usurpations," the Constitution also does not include the ideas of monarchical governments that were popular in Europe, and it does not paint kingdoms and monarchy in a favorable light.
The document mostly outlines the oppressions and injuries the Colonies received at the hand of their king, George III, and accuses him of absolute despotism. (Britain at the time was a constitutional monarchy, not an absolute monarchy.) This list of abuses is not defined in the document as "ideas" but as "facts." A philosophical idea that does appear at the top of the document, however, is that all men are created equal and are endowed with the unalienable rights to life, liberty and happiness.