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DEBT - Debt Issued Prior to Fiscal 2018 Still Outstanding (Details) - USD ($) | Apr. 27, 2015 | Dec. 03, 2010 | Dec. 31, 2021 | Jan. 01, 2021 | Feb. 01, 2008 | Dec. 05, 2007 | Feb. 28, 1998 | Jan. 31, 1996
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  |  | $ 0 |  |  |  |  |
Fixed-rate debt | Exelis Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued | $ 2,400,000,000 |  |  |  |  |  |  |
Debt instrument redemption price percentage | 100.00% |  |  |  |  |  |  |
Debt instrument redemption price percentage of principal amount | 101.00% |  |  |  |  |  |  |
Fixed-rate debt | 2025 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued | $ 600,000,000 |  |  |  |  |  |  |
Debt interest rate | 3.832% |  | 3.832% |  |  |  |  |
Debt principal amount |  |  | $ 600,000,000 | $ 600,000,000 |  |  |  |
Fixed-rate debt | 2025 Notes | Treasury Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 0.30% |  |  |  |  |  |  |
Fixed-rate debt | 2035 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued | $ 400,000,000 |  |  |  |  |  |  |
Debt interest rate | 4.854% |  | 4.854% |  |  |  |  |
Debt principal amount |  |  | $ 400,000,000 | 400,000,000 |  |  |  |
Fixed-rate debt | 2035 Notes | Treasury Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 0.35% |  |  |  |  |  |  |
Fixed-rate debt | 2045 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued | $ 500,000,000 |  |  |  |  |  |  |
Debt interest rate | 5.054% |  | 5.054% |  |  |  |  |
Debt principal amount |  |  | $ 500,000,000 | 500,000,000 |  |  |  |
Fixed-rate debt | 2045 Notes | Treasury Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 0.40% |  |  |  |  |  |  |
Fixed-rate debt | 2040 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  | $ 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 principal amount |  |  | $ 300,000,000 | 300,000,000 |  |  |  |
Fixed-rate debt | 7.00% debentures, due January 15, 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 100,000,000
Debt interest rate |  |  | 7.00% |  |  |  |  | 7.00%
Debt principal amount |  |  | $ 100,000,000 | 100,000,000 |  |  |  |
Fixed-rate debt | 6.35% debentures, due February 1, 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  | 6.35% |  |  |  |  |
Notes payable |  |  |  |  |  |  | $ 150,000,000 |
Repurchased and retire principal amount of debentures |  |  |  |  |  | $ 25,000,000 |  |
Redemption of debentures |  |  |  |  | $ 99,000,000 |  |  |
Debt principal amount |  |  | $ 26,000,000 | $ 26,000,000 |  |  |  |

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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=123466204&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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