Long-Term Debt and Credit Facilities - Revolving Letters of Credit and Senior Notes (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Revolving Credit Facility
Long-term Debt and Credit Facilities
Letters of credit outstanding	$ 0	$ 0
Lumen Technologies, Inc. \| Letter of Credit \| Uncommitted Revolving Letter of Credit Facility
Long-term Debt and Credit Facilities
Maximum borrowing capacity	225
Letters of credit outstanding	$ 88	97
Lumen Technologies, Inc. \| Senior Notes
Long-term Debt and Credit Facilities
Redemption price, percentage	101.00%
Level 3 Parent, LLC \| Letter of Credit
Long-term Debt and Credit Facilities
Letters of credit outstanding	$ 9	18
Level 3 Parent, LLC \| Letter of Credit \| Collateralized Debt Obligations
Long-term Debt and Credit Facilities
Letters of credit outstanding	$ 5	$ 11

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- 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

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