Debt - Schedule of Outstanding Debt (Details) - USD ($) $ in Millions	Mar. 29, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 7,400	$ 7,400
Unamortized discounts, premiums and debt issuance costs	(34)	(35)
Total debt, including unamortized discounts, premiums, debt issuance costs and fair value adjustments	7,366	7,365
Long-term debt	$ 7,366	7,365
Unsecured Debt \| Fixed-rate 4.125% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	4.125%
Debt instrument, principal amount	$ 1,350	$ 1,350
Effective rate	4.125%	4.125%
Unsecured Debt \| Fixed-rate 4.625% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	4.625%
Debt instrument, principal amount	$ 400	$ 400
Effective rate	4.625%	4.625%
Unsecured Debt \| Fixed-rate 3.875% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	3.875%
Debt instrument, principal amount	$ 1,000	$ 1,000
Effective rate	3.875%	3.875%
Unsecured Debt \| Fixed-rate 4.625% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	4.625%
Debt instrument, principal amount	$ 900	$ 900
Effective rate	4.625%	4.625%
Unsecured Debt \| Fixed-rate 4.875% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	4.875%
Debt instrument, principal amount	$ 1,000	$ 1,000
Effective rate	4.875%	4.875%
Unsecured Debt \| Fixed-rate 5.35% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	5.35%
Debt instrument, principal amount	$ 500	$ 500
Effective rate	5.35%	5.35%
Unsecured Debt \| Fixed-rate 3.875% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	3.875%
Debt instrument, principal amount	$ 750	$ 750
Effective rate	3.875%	3.875%
Unsecured Debt \| Fixed-rate 5.55% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	5.55%
Debt instrument, principal amount	$ 500	$ 500
Effective rate	5.55%	5.55%
Unsecured Debt \| Fixed-rate 4.3% senior unsecured notes
Debt Instrument [Line Items]
Stated interest rate	4.30%
Debt instrument, principal amount	$ 1,000	$ 1,000
Effective rate	4.30%	4.30%
Revolving Credit Facility \| Floating-rate revolving credit facility (RCF)
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 0	$ 0
Effective rate	0.00%	0.00%

Amount of short-term and long-term debt and lease obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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=119400593&loc=d3e572229-122910

+ Details

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

- 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=114775744&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

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

Reference 2: 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=114775744&loc=d3e28551-108399

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)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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=6877327&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

Amount of unamortized debt discount (premium) and debt issuance costs.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

+ 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate4.125SeniorUnsecuredNotesMaturingJune2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate4.625SeniorUnsecuredNotesMaturingJune2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate3.875SeniorUnsecuredNotesMaturingSeptember2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate4.625SeniorUnsecuredNotesMaturingJune2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate4.875SeniorUnsecuredNotesMaturingMarch2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate5.350SeniorUnsecuredNotesMaturingMarch2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate3.875SeniorUnsecuredNotesMaturingJune2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate5.550SeniorUnsecuredNotesMaturingDecember2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FixedRate4.3SeniorUnsecuredNotesMaturingJune2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=nxpi_FloatingRateRevolvingCreditFacilityMaturingDecember2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: