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Business Segment Information - Revenues and Income From Continuing Operations by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 28, 2018 | Dec. 29, 2017 | Dec. 28, 2018 | Dec. 29, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 1,666 | $ 1,535 | $ 3,208 | $ 2,945
Income From Continuing Operations Before Income Taxes |  |  |  |
Non-operating income | 47 | 44 | 94 | 90
Net interest expense | (43) | (41) | (86) | (82)
Income from continuing operations before income taxes | 271 | 225 | 528 | 453
Communication Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 540 | 492 | 1,009 | 898
Electronic Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 617 | 582 | 1,206 | 1,123
Space and Intelligence Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 513 | 462 | 1,001 | 928
Operating Segments | Communication Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 540 | 492 | 1,009 | 898
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income | 162 | 145 | 302 | 260
Operating Segments | Electronic Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 617 | 582 | 1,206 | 1,123
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income | 117 | 97 | 232 | 206
Operating Segments | Space and Intelligence Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 513 | 462 | 1,001 | 928
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income | 92 | 80 | 178 | 167
Corporate eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (4) | (1) | (8) | (4)
Unallocated corporate expense and corporate eliminations |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |
Segment operating income | (58) | (54) | (99) | (96)
Pension adjustment | (46) | (46) | (93) | (92)
Adjustment for deferred compensation |  | 12 |  | 12
Unallocated corporate expense and corporate eliminations | Exelis |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |
Amortization of intangible assets | 26 | $ 25 | 51 | $ 50
Unallocated corporate expense and corporate eliminations | L3 Technologies, Inc. |  |  |  |
Income From Continuing Operations Before Income Taxes |  |  |  |
Merger-related transaction and integration costs | $ 13 |  | $ 13 |

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