Debt - Narrative (Details)																		12 Months Ended
	Sep. 19, 2022 USD ($) seniorNote	Sep. 12, 2022 USD ($)	Aug. 15, 2022 USD ($) $ / shares	Jun. 01, 2022 USD ($)	Apr. 02, 2022 USD ($) $ / shares	Apr. 01, 2022 USD ($) $ / shares	Mar. 18, 2022 USD ($) $ / shares	May 20, 2021 USD ($) $ / shares	May 07, 2021	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	Mar. 31, 2023 USD ($)	Apr. 01, 2022 USD ($) $ / shares	Apr. 02, 2021 USD ($) $ / shares	Apr. 28, 2023 USD ($)	Jan. 19, 2023 USD ($)	Sep. 15, 2020 USD ($)	Aug. 01, 2016 USD ($)	Mar. 04, 2016 USD ($)
Debt Instrument [Line Items]
Interest expense paid																		$ 390,000,000	$ 120,000,000	$ 139,000,000
Loss on extinguishment of debt																		(9,000,000)	(3,000,000)	20,000,000
Undrawn revolving line of credit		$ 1,000,000,000
Aggregate acquisition amount benchmark		$ 250,000,000
Total principal amount						$ 3,747,000,000												9,899,000,000	3,747,000,000
Stated interest rate					2.00%
Special dividend (in dollars per share) | $ / shares															$ 12
Extinguishment of debt with borrowings from same creditors																		0	$ 494,000,000	0
Accounting Standards Update [Extensible Enumeration]					Accounting Standards Update 2020-06														Accounting Standards Update 2020-06
Retained earnings (accumulated deficit)						(1,940,000,000)												(585,000,000)	$ (1,940,000,000)
Exchange and extinguishment of convertible notes, equity adjustment																		100,000,000
Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Debt instrument, unamortized discount					$ 1,000,000
Senior Notes
Debt Instrument [Line Items]
Number of debt instrument | seniorNote	2																2
Convertible debt
Debt Instrument [Line Items]
Loss on extinguishment of debt													$ 2,000,000
Conversion period prior to maturity dates														6 months
Payments in lieu of conversion price adjustments																		1,000,000	8,000,000	$ 12,000,000
Convertible debt | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Dilutive earnings per share (in dollars per share) | $ / shares					$ 0.01
Secured Overnight Financing Rate (SOFR) | Avast plc
Debt Instrument [Line Items]
Basis spread on variable rate		100.00%
Term Loan Due November 4, 2024
Debt Instrument [Line Items]
Debt instrument term																5 years
Principal amount																$ 500,000,000
Delayed Term Loan Due November4, 2024
Debt Instrument [Line Items]
Debt instrument term																5 years
Principal amount																$ 750,000,000
First Amendment Additional Term Loan Due May 7, 2026
Debt Instrument [Line Items]
Principal amount																		525,000,000
Credit Agreement, First Amendment
Debt Instrument [Line Items]
Quarterly installment payment (as a percent)									1.25%
Delayed Draw Term Loan Due November 4, 2024
Debt Instrument [Line Items]
Principal amount		$ 1,703,000,000
Quarterly installment payment (as a percent)									1.25%
Interest expense paid		3,000,000
Loss on extinguishment of debt		2,000,000
Delayed Draw Term Loan Due November 4, 2024 | Line of Credit
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 4,000,000
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%
Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Leverage ratio		5.25
Amended and Restated Credit Agreement | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.125%
Amended and Restated Credit Agreement | Minimum | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		0.125%
Amended and Restated Credit Agreement | Maximum
Debt Instrument [Line Items]
Leverage ratio		5.75
Amended and Restated Credit Agreement | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Amended and Restated Credit Agreement | Maximum | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
Amended and Restated Credit Agreement | Weighted Average
Debt Instrument [Line Items]
Leverage ratio		6.0
5.0% Senior Notes due April 15, 2025 | Senior Notes
Debt Instrument [Line Items]
Total 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]
Principal 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%
3.95% Senior Notes due June 15, 2022 | Senior Notes
Debt Instrument [Line Items]
Principal amount				$ 400,000,000
Interest expense paid				$ 7,000,000
Total principal amount						400,000,000												$ 0	400,000,000
Stated interest rate				3.95%														3.95%
6.75% And 7.125% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 1,500,000,000
6.75% Senior Notes due September 30, 2027 | Senior Notes
Debt Instrument [Line Items]
Total principal amount						0												$ 900,000,000	0
Stated interest rate	6.75%																	6.75%
7.125% Senior Notes due September 30, 2030 | Senior Notes
Debt Instrument [Line Items]
Total principal amount						0												$ 600,000,000	0
Stated interest rate	7.125%																	7.125%
2.5% Convertible Senior Notes Due April 1, 2022 | Convertible debt
Debt Instrument [Line Items]
Principal amount																									$ 500,000,000
Stated interest rate								2.50%							2.50%										2.50%
Extinguishment of debt with borrowings from same creditors															$ 250,000,000
2.0% Convertible Senior Notes Due August 15, 2022 | Convertible debt
Debt Instrument [Line Items]
Principal amount																								$ 1,250,000,000
Stated interest rate			2.00%												2.00%									2.00%
Extinguishment of debt with borrowings from same creditors															$ 625,000,000
Payment for debt extinguishment			$ 630,000,000							$ 1,176,000,000
Exchange and extinguishment of convertible notes, equity adjustment										578,000,000
Exchange and extinguishment of convertible notes, equity adjustment			100,000,000
New 2.5% Convertible Senior Notes due April 1, 2022 | Convertible debt
Debt Instrument [Line Items]
Principal amount								$ 250,000,000				$ 250,000,000		$ 250,000,000
Interest expense paid								1,000,000				$ 2,000,000
Loss on extinguishment of debt								$ (2,000,000)			$ (1,000,000)
Stated interest rate								2.50%				2.50%	2.50%		2.50%			2.50%
Cash notes payments per share (in dollars per share) | $ / shares															$ 12
Conversion ratio													0.0596341	0.1189814
Dilutive earnings per share (in dollars per share) | $ / shares								$ 24.40				$ 19	$ 16.77	$ 8.40						$ 16.77
Cash note payments													$ 179,000,000
Payment for debt extinguishment								$ 364,000,000				$ 566,000,000
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 2.00% Convertible Unsecured Notes due August 15, 2022 | Convertible debt
Debt Instrument [Line Items]
Principal amount							$ 100,000,000			625,000,000				$ 625,000,000
Interest expense paid										3,000,000
Loss on extinguishment of debt							$ 1,000,000			$ 20,000,000
Total principal amount						$ 525,000,000													$ 525,000,000
Stated interest rate							2.00%			2.00%			2.00%		2.00%			2.00%
Cash notes payments per share (in dollars per share) | $ / shares															$ 12
Conversion ratio													0.0489860	0.0977364
Dilutive earnings per share (in dollars per share) | $ / shares						$ 20.41	$ 28.32			$ 19.25			$ 20.41	$ 10.23					$ 20.41	$ 20.41
Cash note payments													$ 367,000,000
Payment for debt extinguishment							$ 139,000,000
Exchange and extinguishment of convertible notes, equity adjustment							$ 40,000,000
Equity component net of tax						$ 56,000,000													$ 56,000,000
New 2.00% Convertible Notes | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Debt instrument, unamortized discount					$ 1,000,000
Substantial premium					47,000,000
Retained earnings (accumulated deficit)					$ 6,000,000
New 2.00% Convertible Notes | Convertible debt
Debt Instrument [Line Items]
Stated interest rate					2.00%
New 2.00% Convertible Notes | Convertible debt | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Equity component net of tax					$ 56,000,000
Debt instrument, unamortized discount					$ 9,000,000
Substantial premium						47,000,000
New 2.00% Convertible Unsecured Notes due August 15, 2022 | Convertible debt
Debt Instrument [Line Items]
Principal amount			525,000,000
Interest expense paid			$ 5,000,000
Total principal amount						$ 525,000,000												$ 0	$ 525,000,000
Stated interest rate																		2.00%
Dilutive earnings per share (in dollars per share) | $ / shares			$ 20.41
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%
Revolving Credit Facility | Amended and Restated Credit Agreement | Avast plc
Debt Instrument [Line Items]
Principal amount		$ 1,500,000,000
Term Loan Interim Facility A | Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Quarterly installment payment (as a percent)		1.25%
Term Loan Interim Facility A | Amended and Restated Credit Agreement | Avast plc
Debt Instrument [Line Items]
Principal amount		$ 3,910,000,000
Term Loan Interim Facility B | Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Quarterly installment payment (as a percent)		0.25%
Voluntary prepayment amount																						$ 250,000,000
Term Loan Interim Facility B | Amended and Restated Credit Agreement | Subsequent Event
Debt Instrument [Line Items]
Voluntary prepayment amount																					$ 150,000,000
Term Loan Interim Facility B | Amended and Restated Credit Agreement | Avast plc
Debt Instrument [Line Items]
Principal amount		$ 3,690,000,000
Bridge Loan | Amended and Restated Credit Agreement | Avast plc
Debt Instrument [Line Items]
Principal amount		750,000,000
Loss on extinguishment of debt		$ 3,000,000