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DEBT - Debt Issued Prior to Fiscal 2018 Still Outstanding (Details) - Fixed-rate debt - USD ($) | Apr. 27, 2015 | Dec. 03, 2010 | Jan. 01, 2021 | Jan. 03, 2020 | Feb. 01, 2008 | Dec. 05, 2007 | Feb. 28, 1998 | Jan. 31, 1996
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Exelis Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | $ 2,400,000,000 |  |  |  |  |  |  |
Debt instrument redemption price percentage | 100.00% |  |  |  |  |  |  |
Debt instrument redemption price percentage of principal amount | 101.00% |  |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  | $ 600,000,000 | $ 600,000,000 |  |  |  |
Debt interest rate |  |  | 3.832% |  |  |  |  |
2025 Notes | Treasury Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 0.30% |  |  |  |  |  |  |
2035 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  | $ 400,000,000 | 400,000,000 |  |  |  |
Debt interest rate |  |  | 4.854% |  |  |  |  |
2035 Notes | Treasury Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 0.35% |  |  |  |  |  |  |
2045 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  | $ 500,000,000 | 500,000,000 |  |  |  |
Debt interest rate |  |  | 5.054% |  |  |  |  |
2045 Notes | Treasury Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 0.40% |  |  |  |  |  |  |
2040 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  | $ 300,000,000 | 300,000,000 |  |  |  |
Debt interest rate |  | 6.15% | 6.15% |  |  |  |  |
Debt instrument redemption price percentage |  | 100.00% |  |  |  |  |  |
Interest rate margin |  | 0.35% |  |  |  |  |  |
Debt instrument redemption price percentage of principal amount |  | 101.00% |  |  |  |  |  |
Debt issued |  | $ 300,000,000 |  |  |  |  |  |
7.00% debentures, due January 15, 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  | $ 100,000,000 | 100,000,000 |  |  |  |
Debt interest rate |  |  | 7.00% |  |  |  |  | 7.00%
Debt issued |  |  |  |  |  |  |  | $ 100,000,000
6.35% debentures, due February 1, 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  | $ 150,000,000 |
Debt |  |  | $ 26,000,000 | $ 26,000,000 |  |  |  |
Debt interest rate |  |  |  |  |  |  | 6.35% |
Repurchased and retire principal amount of debentures |  |  |  |  |  | $ 25,000,000 |  |
Redemption of debentures |  |  |  |  | $ 99,000,000 |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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