Represents the redemption price of the debt instrument as a percentage of the principal amount.

No definition available.

Name:	lvlt_DebtInstrumentRedemptionPriceAsPercentageOfPrincipalAmount
Namespace Prefix:	lvlt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Upfront basis point (i.e. a percentage of par)

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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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://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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

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Period Type:	instant

- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

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

+ Details

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- 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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

+ Details

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Period Type:	duration

- Details

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- Details

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Subsequent Events Subsequent Events (Details) (Level 3 Financing [Member], USD $)	0 Months Ended	3 Months Ended
	Apr. 02, 2015	Jun. 30, 2015	Mar. 31, 2015	Mar. 04, 2011	Apr. 28, 2015	Jan. 29, 2015	May 06, 2015
9.375% Senior Notes due 2019
Subsequent Event [Line Items]
Debt Instrument, Face Amount				$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage			9.375%
9.375% Senior Notes due 2019 \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument Redemption Price as Percentage of Principal Amount	104.688%
Gains (Losses) on Extinguishment of Debt		36,000,000
Senior Notes 5.125 Percent Due 2023 [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount					700,000,000
Debt Instrument, Interest Rate, Stated Percentage					5.125%
Senior Notes 5.375 Percent Due 2025 [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount					800,000,000
Debt Instrument, Interest Rate, Stated Percentage					5.375%
Senior Notes 5point 625Percent Due 2023 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount						500,000,000
Debt Instrument, Interest Rate, Stated Percentage			5.625%
8.125% Senior Notes due 2019
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			8.125%
8.125% Senior Notes due 2019 \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount					1,200,000,000.0
8.875% Senior Notes due 2019 \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount					300,000,000
Debt Instrument, Interest Rate, Stated Percentage					8.875%
Senior Notes 8.875 percent due 2019 and 8.125 percent due 2019 [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Gains (Losses) on Extinguishment of Debt		100,000,000
TrancheB2022TermLoanTotal [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount							2,000,000,000
2.0 Billion Tranche B-II 2022 Term Loan [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount							2,000,000,000
Gains (Losses) on Extinguishment of Debt		$ 27,000,000
Upfront basis point		25
London Interbank Offered Rate (LIBOR) [Member] \| 2.0 Billion Tranche B-II 2022 Term Loan [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
Debt Instrument, Basis Spread on Variable Rate		2.75%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum		0.75%