Significant Accounting Policies and Recent Accounting Standards	9 Months Ended
	Oct. 01, 2021
Accounting Policies [Abstract]
Significant Accounting Policies and Recent Accounting Standards	Note A — Significant Accounting Policies and Recent Accounting Standards Basis of Presentation The accompanying Condensed Consolidated Financial Statements (Unaudited) include the accounts of L3Harris Technologies, Inc. and its consolidated subsidiaries. As used in these Notes to Condensed Consolidated Financial Statements (Unaudited) (these “Notes”), the terms “L3Harris,” “Company,” “we,” “our” and “us” refer to L3Harris Technologies, Inc. and its consolidated subsidiaries. Intracompany transactions and accounts have been eliminated in consolidation. The accompanying Condensed Consolidated Financial Statements (Unaudited) have been prepared by L3Harris in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, such interim financial statements do not include all information and footnotes necessary for a complete presentation of financial condition, results of operations, cash flows and equity in conformity with GAAP for annual financial statements. In the opinion of management, such interim financial statements reflect all adjustments (including normal recurring adjustments) considered necessary for a fair presentation of our financial condition, results of operations, cash flows and equity for the periods presented therein. The results for the quarter and three quarters ended October 1, 2021 are not necessarily indicative of the results that may be expected for the full fiscal year or any subsequent period. The balance sheet at January 1, 2021 has been derived from our audited financial statements, but does not include all of the information and footnotes required by GAAP for annual financial statements. We provide complete, audited financial statements in our Annual Report on Form 10-K, which includes information and footnotes required by the rules and regulations of the SEC. The information included in this Quarterly Report on Form 10-Q (this “Report”) should be read in conjunction with the Management’s Discussion and Analysis of Financial Condition and Results of Operations and the Consolidated Financial Statements and accompanying Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended January 1, 2021 (our “Fiscal 2020 Form 10-K”). Amounts contained in this Report may not always add to totals due to rounding. Supplemental Cash Flow Information Non-cash investing and financing activities during the three quarters ended October 1, 2021 included a $88 million right-of-use asset we obtained in exchange for a corresponding operating lease liability. These non-cash investing and financing activities are excluded from the “Other investing” and “Other financing” line items in our Condensed Consolidated Statement of Cash Flows (Unaudited). Right-of-use assets for operating leases are included in the “Operating lease right-of-use assets” line item and the corresponding operating lease liabilities are included in the “Other accrued items” and “Operating lease liabilities” line items in our Condensed Consolidated Balance Sheet (Unaudited). Non-cash investing and financing activities during the three quarters ended October 1, 2021 included a $120 million right-of-use asset we obtained in exchange for a corresponding finance lease liability. These non-cash investing and financing activities are excluded from the “Additions of property, plant and equipment” and “Net proceeds from borrowings” line items in our Condensed Consolidated Statement of Cash Flows (Unaudited). Right-of-use assets for finance leases are included in the “Property, plant and equipment, net” line item and the corresponding finance lease liabilities are included in the “Current portion of long-term debt, net” and “Long-term debt, net” line items in our Condensed Consolidated Balance Sheet (Unaudited). There were no material non-cash investing or financing activities during the three quarters ended October 2, 2020. Reclassifications The classification of certain prior-year amounts have been adjusted in our Condensed Consolidated Financial Statements (Unaudited) to conform to current-year classifications. Reclassifications include finance lease liabilities that were previously included in the “Other accrued items” and “Other long-term liabilities” line items and are now reflected in the “Current portion of long-term debt, net” and “Long-term debt, net” line items in our Condensed Consolidated Balance Sheet (Unaudited). Use of Estimates The preparation of financial statements in accordance with GAAP requires us to make estimates and assumptions that affect the amounts reported in the accompanying Condensed Consolidated Financial Statements (Unaudited) and these Notes and related disclosures. These estimates and assumptions are based on experience and other information available prior to issuance of the accompanying Condensed Consolidated Financial Statements (Unaudited) and these Notes. Materially different results can occur as circumstances change and additional information becomes known. Significant Accounting Policies UpdateThere have been no material changes to our significant accounting policies described in our Fiscal 2020 Form 10-K.