Cash payments in lieu of conversion price adjustment for convertible debt, recognized in equity

No definition available.

Name:	nlok_CashNotePayments
Namespace Prefix:	nlok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt Instrument, Convertible, Conversion Period Prior To Maturity Dates

+ References

No definition available.

+ Details

Name:	nlok_DebtInstrumentConvertibleConversionPeriodPriorToMaturityDates
Namespace Prefix:	nlok_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

- Definition

Debt Instrument, Covenant Term, Consolidated Leverage Ratio

+ References

No definition available.

+ Details

Name:	nlok_DebtInstrumentCovenantTermConsolidatedLeverageRatio
Namespace Prefix:	nlok_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Covenant Term, Consolidated Leverage Ratio If Acquisition Incurred

+ References

No definition available.

+ Details

Name:	nlok_DebtInstrumentCovenantTermConsolidatedLeverageRatioIfAcquisitionIncurred
Namespace Prefix:	nlok_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Number

+ References

No definition available.

+ Details

Name:	nlok_DebtInstrumentNumber
Namespace Prefix:	nlok_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Principal Quarterly Installment Payment As Percentage Of Aggregate Principal Amount

+ References

No definition available.

+ Details

Name:	nlok_DebtInstrumentPrincipalQuarterlyInstallmentPaymentAsPercentageOfAggregatePrincipalAmount
Namespace Prefix:	nlok_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Payments In Lieu Of Conversion Price Adjustments

+ References

No definition available.

+ Details

Name:	nlok_PaymentsInLieuOfConversionPriceAdjustments
Namespace Prefix:	nlok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Special Dividend

+ References

No definition available.

+ Details

Name:	nlok_SpecialDividend
Namespace Prefix:	nlok_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 25
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799

+ Details

Name:	us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

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(a)(5))
-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 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

+ Details

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

+ Details

Name:	us-gaap_InterestPaidNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

+ Details

Name:	us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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)(3)
-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(a)(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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 4: 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

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_ProceedsFromLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_TermLoanDueNovember42024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_DelayedTermLoanDueNovember42024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_FirstAmendmentAdditionalTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_CreditAgreementFirstAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_A2019CreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_A5.0SeniorNotesDueApril152025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_A4.2SeniorNotesDueSeptember152020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_A3.95SeniorNotesDueJune152022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_A2.5ConvertibleSeniorNotesDueApril12021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_A2.0ConvertibleSeniorNotesDueAugust152021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_New25ConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlok_New2.0ConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Narrative) (Details)											12 Months Ended
Debt (Narrative) (Details)	May 13, 2021 USD ($) $ / shares	May 07, 2021 USD ($)	Sep. 14, 2020 USD ($)	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 ($)	Apr. 02, 2021 USD ($) seniorNote $ / shares	Apr. 03, 2020 USD ($) $ / shares	Mar. 29, 2019 USD ($) $ / shares	Sep. 15, 2020 USD ($)	Feb. 09, 2017 USD ($)	Aug. 01, 2016 USD ($)	Mar. 04, 2016 USD ($)
Debt Instrument [Line Items]
Long-term debt											$ 3,601,000,000	$ 4,221,000,000
Debt, gross											3,620,000,000	4,250,000,000
Special dividend (in dollars per share) \| $ / shares									$ 12
Extinguishment of debt with borrowings from the same creditors											0	1,073,000,000	$ 0
Gain (loss) on extinguishment of debt											20,000,000	0	0
Payment for debt extinguishment											0	546,000,000	0
Payment of accrued interest											$ 139,000,000	179,000,000	183,000,000
Share price (in dollars per share) \| $ / shares											$ 21.42
Term Loan due November 4, 2024
Debt Instrument [Line Items]
Debt instrument term										5 years
Debt Instrument, face amount										$ 500,000,000
Delayed Term Loan due November 4, 2024
Debt Instrument [Line Items]
Debt instrument term										5 years
Debt Instrument, face amount										$ 750,000,000
Amount drawn from credit agreement			$ 750,000,000
Quarterly installment payment (as a percent)										1.25%
First Amendment Additional Term Loan \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument term		5 years
Debt Instrument, face amount		$ 525,000,000
Credit Agreement, First Amendment \| Subsequent Event
Debt Instrument [Line Items]
Long-term debt		$ 1,750,000,000
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
Senior Notes
Debt Instrument [Line Items]
Number of debt instrument \| seniorNote											2
Senior Notes \| 5.0% Senior Notes due April 15, 2025
Debt Instrument [Line Items]
Debt, gross											$ 1,100,000,000	1,100,000,000			$ 1,100,000,000
Stated interest rate (as a percent)											5.00%				5.00%
Senior Notes \| 4.20% Senior Notes due September 15, 2020
Debt Instrument [Line Items]
Debt Instrument, face amount														$ 750,000,000
Debt, gross											$ 0	$ 750,000,000
Stated interest rate (as a percent)											4.20%	4.20%		4.20%
Senior Notes \| 3.95% Senior Notes due June 15, 2022
Debt Instrument [Line Items]
Debt, gross											$ 400,000,000	$ 400,000,000
Stated interest rate (as a percent)											3.95%				3.95%
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											$ 12,000,000	$ 11,000,000	$ 0
Convertible Debt \| 2.5% Convertible Senior Notes due April 1, 2021
Debt Instrument [Line Items]
Debt Instrument, face amount																	$ 500,000,000
Stated interest rate (as a percent)					2.50%		2.50%		2.50%								2.50%
Extinguishment of debt with borrowings from the same creditors									$ 250,000,000
Conversion price (in USD per share) \| $ / shares												$ 8.40	$ 16.77
Convertible Debt \| 2.0% Convertible Senior Notes due August 15, 2021
Debt Instrument [Line Items]
Debt Instrument, face amount																$ 1,250,000,000
Stated interest rate (as a percent)				2.00%			2.00%		2.00%							2.00%
Extinguishment of debt with borrowings from the same creditors									$ 625,000,000
Conversion price (in USD per share) \| $ / shares												$ 10.23	$ 20.41
Payment for debt extinguishment				$ 1,176,000,000
Exchange and extinguishment of convertible notes, equity adjustment				578,000,000
Convertible Debt \| New 2.5% Convertible Senior Notes due April 1, 2022
Debt Instrument [Line Items]
Debt Instrument, face amount						$ 250,000,000		$ 250,000,000
Long-term debt											250,000,000	$ 249,000,000
Debt, gross											$ 250,000,000	$ 250,000,000
Stated interest rate (as a percent)						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
Conversion price (in USD per share) \| $ / shares						$ 19	$ 16.77	$ 8.40			$ 16.77	$ 16.77
Cash note payments							$ 179,000,000
Gain (loss) on extinguishment of debt					$ (1,000,000)
Payment for debt extinguishment						$ 566,000,000
Payment of accrued interest						2,000,000
Payments in lieu of conversion price adjustments						$ 1,000,000
Exchange and extinguishment of convertible notes, equity adjustment					$ 316,000,000
Debt Instrument, if-converted, value in excess of principal											$ 69,000,000
Convertible Debt \| New 2.5% Convertible Senior Notes due April 1, 2022 \| Subsequent Event
Debt Instrument [Line Items]
Conversion price (in USD per share) \| $ / shares	$ 16.77
Payment for debt extinguishment	$ 365,000,000
Convertible Debt \| New 2.0% Convertible Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Debt Instrument, face amount				$ 625,000,000				$ 625,000,000
Long-term debt											620,000,000	$ 616,000,000
Debt, gross											$ 625,000,000	$ 625,000,000
Stated interest rate (as a percent)				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
Conversion price (in USD per share) \| $ / shares				$ 19.25			$ 20.41	$ 10.23			$ 20.41	$ 20.41
Cash note payments							$ 367,000,000
Gain (loss) on extinguishment of debt				$ 20,000,000
Payment of accrued interest				$ 3,000,000
Debt Instrument, if-converted, value in excess of principal											$ 31,000,000
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	$ 0
Minimum \| Base Rate \| 2019 Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate										0.125%
Minimum \| LIBOR \| 2019 Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate										1.125%
Minimum \| Revolving Credit Facility \| 2019 Credit Facility
Debt Instrument [Line Items]
Commitment fee( as a percent)										0.125%
Maximum \| Base Rate \| 2019 Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate										0.75%
Maximum \| LIBOR \| 2019 Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate										1.75%
Maximum \| Revolving Credit Facility \| 2019 Credit Facility
Debt Instrument [Line Items]
Commitment fee( as a percent)										0.30%