CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income (loss)	$ 772us-gaap_NetIncomeLoss	$ (239)us-gaap_NetIncomeLoss	$ 777us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	4,428	4,541	4,780
Impairment of goodwill (Note 2)	0us-gaap_GoodwillImpairmentLoss	1,092us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Impairment of assets	32us-gaap_OtherAssetImpairmentCharges	0us-gaap_OtherAssetImpairmentCharges	0us-gaap_OtherAssetImpairmentCharges
Deferred income taxes	291us-gaap_DeferredIncomeTaxExpenseBenefit	391us-gaap_DeferredIncomeTaxExpenseBenefit	394us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for uncollectible accounts	159us-gaap_ProvisionForDoubtfulAccounts	152us-gaap_ProvisionForDoubtfulAccounts	187us-gaap_ProvisionForDoubtfulAccounts
Gain on sale of intangible assets	0	(32)	0
Net long-term debt premium amortization	(33)	(57)	(88)
Net (gain) loss on early retirement of debt	0	(10)	179
Share-based Compensation	79us-gaap_ShareBasedCompensation	71us-gaap_ShareBasedCompensation	110us-gaap_ShareBasedCompensation
Changes in current assets and liabilities:
Accounts receivable	(163)	(212)	(154)
Accounts payable	70	(76)	(72)
Accrued income and other taxes	(84)	28	(14)
Other current assets and liabilities, net	(270)	263	16
Retirement benefits	(184)	(342)	(169)
Changes in other noncurrent assets and liabilities, net	99	19	161
Other, net	(8)	(30)	(42)
Net cash provided by operating activities	5,188	5,559	6,065
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software	3,047	3,048	2,919
Cash paid for acquisitions	93	160	0
Proceeds from sale of property and intangible assets	63	80	191
Other, net	0	(20)	38
Net cash used in investing activities	(3,077)	(3,148)	(2,690)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	483	2,481	3,362
Payments of long-term debt	(800)us-gaap_RepaymentsOfDebt	(2,010)us-gaap_RepaymentsOfDebt	(5,118)us-gaap_RepaymentsOfDebt
Net (payments) borrowings on credit facility	4	95	(543)
Early retirement of debt costs	0ctl_PaymentOfDebtIssuanceRetirementCost	(31)ctl_PaymentOfDebtIssuanceRetirementCost	(346)ctl_PaymentOfDebtIssuanceRetirementCost
Dividends paid	(1,228)us-gaap_PaymentsOfDividends	(1,301)us-gaap_PaymentsOfDividends	(1,811)us-gaap_PaymentsOfDividends
Net proceeds from issuance of common stock	50	73	110
Repurchase of common stock	(650)	(1,586)	(37)
Other, net	(2)	15	2
Net cash used in financing activities	(2,151)	(2,454)	(3,295)
Effect of exchange rate changes on cash and cash equivalents	0	0	3
Net (decrease) increase in cash and cash equivalents	(40)	(43)	83
Cash and cash equivalents at beginning of period	168	211	128
Cash and cash equivalents at end of period	128	168	211
Supplemental cash flow information:
Income taxes paid, net	(27)us-gaap_IncomeTaxesPaidNet	(48)us-gaap_IncomeTaxesPaidNet	(82)us-gaap_IncomeTaxesPaidNet
Interest paid (net of capitalized interest of $47, $41 and $43)	$ (1,338)us-gaap_InterestPaidNet	$ (1,333)us-gaap_InterestPaidNet	$ (1,405)us-gaap_InterestPaidNet

The cash outflow for debt issuance retirement costs.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

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

- Definition

The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

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

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

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

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

+ Details

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

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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

- Details

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