Condensed Consolidating Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
Dec. 31, 2017	Oct. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities	$ 308
INVESTING ACTIVITIES
Capital expenditures	(207)
Note receivable - affiliate	(1,825)
Cash related to deconsolidated Venezuela operations	0
Purchase of marketable securities	0
Maturity of marketable securities	0
Proceeds from sale of property, plant and equipment and other assets	0
Other, net	0
Net cash used in investing activities	(2,032)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	0
Payments of long-term debt	(1)
Distributions	(250)
Increase (decrease) due from/to affiliates, net	0
Net cash used in financing activities	(251)
Effect of exchange rates on cash, cash equivalents and restricted cash and securities	(2)
Net increase (decrease) in cash, cash equivalents and restricted cash and securities	(1,977)
Cash, cash equivalents and restricted cash and securities at beginning of period	2,308
Cash, cash equivalents and restricted cash and securities at end of period	331	$ 2,308
Predecessor
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities		1,914	$ 2,343	$ 1,855
INVESTING ACTIVITIES
Capital expenditures		(1,119)	(1,334)	(1,229)
Note receivable - affiliate		0	0	0
Cash related to deconsolidated Venezuela operations		0	0	(83)
Purchase of marketable securities		(1,127)	0	0
Maturity of marketable securities		1,127	0	0
Proceeds from sale of property, plant and equipment and other assets		1	3	4
Other, net		0	0	(14)
Net cash used in investing activities		(1,118)	(1,331)	(1,322)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt		4,569	764	4,832
Payments of long-term debt		(4,917)	(820)	(5,051)
Distributions		0	0	0
Increase (decrease) due from/to affiliates, net		0	0	0
Net cash used in financing activities		(348)	(56)	(219)
Effect of exchange rates on cash, cash equivalents and restricted cash and securities		3	(3)	(18)
Net increase (decrease) in cash, cash equivalents and restricted cash and securities		451	953	296
Cash, cash equivalents and restricted cash and securities at beginning of period	2,308	1,857	904	608
Cash, cash equivalents and restricted cash and securities at end of period		2,308	1,857	904
Eliminations
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities	0
INVESTING ACTIVITIES
Capital expenditures	0
Note receivable - affiliate	0
Net cash used in investing activities	0
FINANCING ACTIVITIES
Payments of long-term debt	0
Distributions	0
Increase (decrease) due from/to affiliates, net	0
Net cash used in financing activities	0
Effect of exchange rates on cash, cash equivalents and restricted cash and securities	0
Net increase (decrease) in cash, cash equivalents and restricted cash and securities	0
Cash, cash equivalents and restricted cash and securities at beginning of period	0
Cash, cash equivalents and restricted cash and securities at end of period	0	0
Eliminations \| Predecessor
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities		0	0	0
INVESTING ACTIVITIES
Capital expenditures		0	0	0
Cash related to deconsolidated Venezuela operations				0
Purchase of marketable securities		0
Maturity of marketable securities		0
Proceeds from sale of property, plant and equipment and other assets		0	0	0
Other, net				0
Net cash used in investing activities		0	0	0
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt		0	0	0
Payments of long-term debt		0	0	0
Increase (decrease) due from/to affiliates, net		0	0	0
Net cash used in financing activities		0	0	0
Effect of exchange rates on cash, cash equivalents and restricted cash and securities		0	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash and securities		0	0	0
Cash, cash equivalents and restricted cash and securities at beginning of period	0	0	0	0
Cash, cash equivalents and restricted cash and securities at end of period		0	0	0
Level 3 Parent, LLC \| Reportable Legal Entities
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities	(1)
INVESTING ACTIVITIES
Capital expenditures	0
Note receivable - affiliate	0
Net cash used in investing activities	0
FINANCING ACTIVITIES
Payments of long-term debt	0
Distributions	(250)
Increase (decrease) due from/to affiliates, net	250
Net cash used in financing activities	0
Effect of exchange rates on cash, cash equivalents and restricted cash and securities	0
Net increase (decrease) in cash, cash equivalents and restricted cash and securities	(1)
Cash, cash equivalents and restricted cash and securities at beginning of period	33
Cash, cash equivalents and restricted cash and securities at end of period	32	33
Level 3 Parent, LLC \| Reportable Legal Entities \| Predecessor
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities		(61)	(49)	(41)
INVESTING ACTIVITIES
Capital expenditures		0	0	0
Cash related to deconsolidated Venezuela operations				0
Purchase of marketable securities		0
Maturity of marketable securities		0
Proceeds from sale of property, plant and equipment and other assets		0	0	0
Other, net				0
Net cash used in investing activities		0	0	0
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt		0	0	0
Payments of long-term debt		0	0	(313)
Increase (decrease) due from/to affiliates, net		57	47	383
Net cash used in financing activities		57	47	70
Effect of exchange rates on cash, cash equivalents and restricted cash and securities		0	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash and securities		(4)	(2)	29
Cash, cash equivalents and restricted cash and securities at beginning of period	33	37	39	10
Cash, cash equivalents and restricted cash and securities at end of period		33	37	39
Level 3 Financing, Inc. \| Reportable Legal Entities
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities	0
INVESTING ACTIVITIES
Capital expenditures	0
Note receivable - affiliate	0
Net cash used in investing activities	0
FINANCING ACTIVITIES
Payments of long-term debt	0
Distributions	0
Increase (decrease) due from/to affiliates, net	0
Net cash used in financing activities	0
Effect of exchange rates on cash, cash equivalents and restricted cash and securities	0
Net increase (decrease) in cash, cash equivalents and restricted cash and securities	0
Cash, cash equivalents and restricted cash and securities at beginning of period	0
Cash, cash equivalents and restricted cash and securities at end of period	0	0
Level 3 Financing, Inc. \| Reportable Legal Entities \| Predecessor
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities		(401)	(468)	(617)
INVESTING ACTIVITIES
Capital expenditures		0	0	0
Cash related to deconsolidated Venezuela operations				0
Purchase of marketable securities		0
Maturity of marketable securities		0
Proceeds from sale of property, plant and equipment and other assets		0	0	0
Other, net				0
Net cash used in investing activities		0	0	0
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt		4,569	764	4,832
Payments of long-term debt		(4,911)	(806)	(4,725)
Increase (decrease) due from/to affiliates, net		743	504	511
Net cash used in financing activities		401	462	618
Effect of exchange rates on cash, cash equivalents and restricted cash and securities		0	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash and securities		0	(6)	1
Cash, cash equivalents and restricted cash and securities at beginning of period	0	0	6	5
Cash, cash equivalents and restricted cash and securities at end of period		0	0	6
Level 3 Communications, LLC \| Reportable Legal Entities
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities	172
INVESTING ACTIVITIES
Capital expenditures	(110)
Note receivable - affiliate	(1,825)
Net cash used in investing activities	(1,935)
FINANCING ACTIVITIES
Payments of long-term debt	0
Distributions	0
Increase (decrease) due from/to affiliates, net	(250)
Net cash used in financing activities	(250)
Effect of exchange rates on cash, cash equivalents and restricted cash and securities	0
Net increase (decrease) in cash, cash equivalents and restricted cash and securities	(2,013)
Cash, cash equivalents and restricted cash and securities at beginning of period	2,199
Cash, cash equivalents and restricted cash and securities at end of period	186	2,199
Level 3 Communications, LLC \| Reportable Legal Entities \| Predecessor
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities		1,615	565	193
INVESTING ACTIVITIES
Capital expenditures		(667)	(704)	(453)
Cash related to deconsolidated Venezuela operations				0
Purchase of marketable securities		(1,127)
Maturity of marketable securities		1,127
Proceeds from sale of property, plant and equipment and other assets		1	1	0
Other, net				(14)
Net cash used in investing activities		(666)	(703)	(467)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt		0	0	0
Payments of long-term debt		1	(1)	(2)
Increase (decrease) due from/to affiliates, net		(460)	1,107	693
Net cash used in financing activities		(459)	1,106	691
Effect of exchange rates on cash, cash equivalents and restricted cash and securities		0	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash and securities		490	968	417
Cash, cash equivalents and restricted cash and securities at beginning of period	2,200	1,710	742	325
Cash, cash equivalents and restricted cash and securities at end of period		2,200	1,710	742
Other Non-Guarantor Subsidiaries \| Reportable Legal Entities
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities	137
INVESTING ACTIVITIES
Capital expenditures	(97)
Note receivable - affiliate	0
Net cash used in investing activities	(97)
FINANCING ACTIVITIES
Payments of long-term debt	(1)
Distributions	0
Increase (decrease) due from/to affiliates, net	0
Net cash used in financing activities	(1)
Effect of exchange rates on cash, cash equivalents and restricted cash and securities	(2)
Net increase (decrease) in cash, cash equivalents and restricted cash and securities	37
Cash, cash equivalents and restricted cash and securities at beginning of period	76
Cash, cash equivalents and restricted cash and securities at end of period	113	76
Other Non-Guarantor Subsidiaries \| Reportable Legal Entities \| Predecessor
Condensed Consolidating Financial Information
Net cash (used in) provided by operating activities		761	2,295	2,320
INVESTING ACTIVITIES
Capital expenditures		(452)	(630)	(776)
Cash related to deconsolidated Venezuela operations				(83)
Purchase of marketable securities		0
Maturity of marketable securities		0
Proceeds from sale of property, plant and equipment and other assets		0	2	4
Other, net				0
Net cash used in investing activities		(452)	(628)	(855)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt		0	0	0
Payments of long-term debt		(7)	(13)	(11)
Increase (decrease) due from/to affiliates, net		(340)	(1,658)	(1,587)
Net cash used in financing activities		(347)	(1,671)	(1,598)
Effect of exchange rates on cash, cash equivalents and restricted cash and securities		3	(3)	(18)
Net increase (decrease) in cash, cash equivalents and restricted cash and securities		(35)	(7)	(151)
Cash, cash equivalents and restricted cash and securities at beginning of period	$ 75	110	117	268
Cash, cash equivalents and restricted cash and securities at end of period		$ 75	$ 110	$ 117

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