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DEBT - Fixed Rate Debt Issued (Details) - USD ($) | Jun. 04, 2018 | Apr. 27, 2015 | Dec. 03, 2010 | Jun. 29, 2018 | Jun. 30, 2017 | Feb. 01, 2008 | Dec. 05, 2007 | Feb. 01, 1998 | Jan. 15, 1996
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  | $ 0 | $ 29,000,000 |  |  |  |
Exelis Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument redemption price percentage |  | 100.00% |  |  |  |  |  |  |
Exelis Notes | External Credit Rating, Investment Grade |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument redemption price percentage of principal amount |  | 101.00% |  |  |  |  |  |  |
2021 and 2020 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  | $ 2,400,000,000.0 |  |  |  |  |  |  |
2021 and 2020 Notes | New 2028 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issued | $ 850,000,000 |  |  |  |  |  |  |  |
Debt interest rate percentage | 4.40% |  |  | 4.40% |  |  |  |  |
Debt instrument redemption price percentage | 100.00% |  |  |  |  |  |  |  |
Debt instrument redemption price percentage of principal amount | 101.00% |  |  |  |  |  |  |  |
Debt issuance costs | $ 8,000,000 |  |  |  |  |  |  |  |
2021 and 2020 Notes | New 2028 Notes | Treasury Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin | 0.25% |  |  |  |  |  |  |  |
2.700% 2020 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate percentage |  | 2.70% |  |  |  |  |  |  |
Notes payable |  | $ 400,000,000 |  |  |  |  |  |  |
2.700% 2020 Notes | Treasury Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin |  | 0.20% |  |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate percentage |  | 3.832% |  |  |  |  |  |  |
Notes payable |  | $ 600,000,000 |  |  |  |  |  |  |
2025 Notes | Treasury Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin |  | 0.30% |  |  |  |  |  |  |
2035 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate percentage |  | 4.854% |  |  |  |  |  |  |
Notes payable |  | $ 400,000,000 |  |  |  |  |  |  |
2035 Notes | Treasury Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin |  | 0.35% |  |  |  |  |  |  |
2045 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate percentage |  | 5.054% |  |  |  |  |  |  |
Notes payable |  | $ 500,000,000 |  |  |  |  |  |  |
2045 Notes | Treasury Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin |  | 0.40% |  |  |  |  |  |  |
2040 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate percentage |  |  | 6.15% |  |  |  |  |  |
Debt instrument redemption price percentage |  |  | 100.00% |  |  |  |  |  |
Debt instrument redemption price percentage of principal amount |  |  | 101.00% |  |  |  |  |  |
Notes payable |  |  | $ 300,000,000 |  |  |  |  |  |
2040 Notes | Treasury Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin |  |  | 0.35% |  |  |  |  |  |
7.0% debentures, due January 15, 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate percentage |  |  |  |  |  |  |  |  | 7.00%
Notes payable |  |  |  |  |  |  |  |  | $ 100,000,000
6.35% debentures, due February 1, 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate percentage |  |  |  |  |  |  |  | 6.35% |
Notes payable |  |  |  |  |  |  |  | $ 150,000,000 |
Repurchased and retire principal amount of debentures |  |  |  |  |  |  | $ 25,000,000 |  |
Redemption of debentures |  |  |  | $ 26,000,000 |  | $ 99,000,000 |  |  |

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