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Debt - Narrative (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 18, 2022 USD ($) $ / shares | Jan. 28, 2022 USD ($) | Aug. 10, 2021 USD ($) | May 20, 2021 USD ($) $ / shares | Sep. 14, 2020 USD ($) | May 26, 2020 USD ($) $ / shares | Mar. 10, 2020 USD ($) | Mar. 05, 2020 USD ($) $ / shares | Feb. 04, 2020 USD ($) $ / shares | Jan. 31, 2020 USD ($) $ / shares | Nov. 11, 2019 USD ($) $ / shares | Nov. 04, 2019 USD ($) | Feb. 09, 2017 USD ($) seniorNote | Apr. 01, 2022 USD ($) $ / shares | Apr. 02, 2021 USD ($) $ / shares | Apr. 03, 2020 USD ($) $ / shares | Jul. 13, 2021 $ / shares | May 07, 2021 USD ($) | Sep. 15, 2020 USD ($) | Aug. 01, 2016 USD ($) | Mar. 04, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,736,000,000 | $ 3,601,000,000 |  |  |  |  |  |
Aggregater principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,747,000,000 | 3,620,000,000 |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,000,000) | 20,000,000 | $ 0 |  |  |  |  |
Special dividend (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |
Extinguishment of debt with borrowings from the same creditors |  |  |  |  |  |  |  |  |  |  |  |  |  | 494,000,000 | 0 | 1,073,000,000 |  |  |  |  |
Payment for debt extinguishment |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 546,000,000 |  |  |  |  |
Payment of accrued interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120,000,000 | 139,000,000 | 179,000,000 |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26.94 |  |  | $ 27.20 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instrument | seniorNote |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion period prior to maturity dates |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |
Payments in lieu of conversion price adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000 | 12,000,000 | $ 11,000,000 |  |  |  |  |
Initial Term Loan due May 7, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Delayed Term Loan due May 7, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |
Quarterly installment payment (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |
Delayed Draw Term Loan Due November 4, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn from credit agreement |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Amendment Additional Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 525,000,000 |  |  |
Credit Agreement, First Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,741,000,000 |  |  |
Quarterly installment payment (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |
2019 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  | 5.25 |  |  |  |  |  |  |  |  |
Leverage ratio if acquisition incurred |  |  |  |  |  |  |  |  |  |  |  | 5.75 |  |  |  |  |  |  |  |  |
Aggregate acquisition amount benchmark |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |
2019 Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 0.125% |  |  |  |  |  |  |  |  |
2019 Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 1.125% |  |  |  |  |  |  |  |  |
2019 Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |
2019 Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |
5.0% Senior Notes due April 15, 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregater principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
4.2% Senior Notes Due September 15, 2020 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.20% |  |  |  |  |  | 4.20% |  |
3.95% Senior Notes due June 15, 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.95% |  |  |  |  |  |  |  |
2.5% Convertible Senior Notes due April 1, 2022 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Stated interest rate |  |  |  | 2.50% |  |  | 2.50% |  | 2.50% |  | 2.50% |  |  |  |  |  |  |  |  |  | 2.50%
Extinguishment of debt with borrowings from the same creditors |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.40 |  |  |  |  |
2.0% Convertible Senior Notes due August 15, 2022 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250,000,000 |
Stated interest rate |  |  |  |  |  | 2.00% |  |  | 2.00% |  | 2.00% |  |  |  |  |  |  |  |  | 2.00% |
Extinguishment of debt with borrowings from the same creditors |  |  |  |  |  |  |  |  |  |  | $ 625,000,000 |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.23 |  |  |  |  |
Payment for debt extinguishment |  |  |  |  |  | $ 1,176,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange and extinguishment of convertible notes, equity adjustment |  |  |  |  |  | 578,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New 2.5% Convertible Senior Notes due April 1, 2022 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  | $ 250,000,000 |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |
Aggregater principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Stated interest rate |  |  |  | 2.50% |  |  |  | 2.50% | 2.50% |  | 2.50% |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | $ (2,000,000) |  |  | $ (1,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash notes payments per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  | 0.0596341 | 0.1189814 |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 24.40 |  |  |  | $ 19 | $ 16.77 | $ 8.40 |  |  |  |  | $ 16.77 | 16.77 |  |  |  |  |
Cash note payments |  |  |  |  |  |  |  |  | $ 179,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment |  |  |  | $ 364,000,000 |  |  |  | $ 566,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of accrued interest |  |  |  | 1,000,000 |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments in lieu of conversion price adjustments |  |  |  | 1,000,000 |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange and extinguishment of convertible notes, equity adjustment |  |  |  | $ 112,000,000 |  |  | $ 316,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
New 2.0% Convertible Senior Notes due August 15, 2022 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount | $ 100,000,000 |  |  |  |  | $ 625,000,000 |  |  |  | $ 625,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 524,000,000 | $ 620,000,000 |  |  |  |  |  |
Aggregater principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 525,000,000 | $ 625,000,000 |  |  |  |  |  |
Stated interest rate | 2.00% |  |  |  |  | 2.00% |  |  | 2.00% |  | 2.00% |  |  | 2.00% |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ 1,000,000 |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash notes payments per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  | 0.0489860 | 0.0977364 |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 28.32 |  |  |  |  | $ 19.25 |  |  | $ 20.41 | $ 10.23 |  |  |  | $ 20.41 | $ 20.41 | $ 20.41 |  |  |  |  |
Cash note payments |  |  |  |  |  |  |  |  | $ 367,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payment for debt extinguishment | $ 139,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of accrued interest |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange and extinguishment of convertible notes, equity adjustment | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, if-converted, value in excess of principal |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 168,000,000 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Revolving Credit Facility | 2019 Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee |  |  |  |  |  |  |  |  |  |  |  | 0.125% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | 2019 Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee |  |  |  |  |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |
Term Loan Interim Facility B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 3,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim Revolving Facility A1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Interim Facility A2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim Revolving Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility increase |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Cash payments in lieu of conversion price adjustment for convertible debt, recognized in equity + References No definition available. + Details
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Namespace Prefix: | nlok_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Debt Instrument, Convertible, Conversion Period Prior To Maturity Dates + References No definition available. + Details
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Namespace Prefix: | nlok_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt Instrument, Covenant Term, Aggregate Acquisition Amount Benchmark + References No definition available. + Details
Name: | nlok_DebtInstrumentCovenantTermAggregateAcquisitionAmountBenchmark
Namespace Prefix: | nlok_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Debt Instrument, Covenant Term, Consolidated Leverage Ratio + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 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(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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