Long-Term Debt, Financing and Capital Lease Obligations (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	May 01, 2014	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2013	Jul. 10, 2013	Dec. 31, 2012	Feb. 24, 2015	Sep. 11, 2013	Dec. 12, 2013	Dec. 31, 2014 tranche	Apr. 02, 2013	Oct. 31, 2014
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt issued by 100% owned subsidiary and is fully and unconditionally guaranteed by the parent		$ 21,500,000,000
Secured debt		1,300,000,000
Secured Debt Collateral		14,600,000,000
Redeemable notes		30,100,000,000
Principal amount of notes with the right to require the Company to repurchase on change of control		21,600,000,000
Percentage of principal amount required to repurchase notes on change of control		101.00%
Fixed amount of cash for a fixed principal amount of notes surrendered that becomes exchangeable at the holder's option								706.21
Fixed principal amount of notes surrendered for a fixed amount of cash that becomes exchangeable at the holder's option								1,000
Number of cell sites leased back		3,000
Term in years for cell sites leased back renewal options		20
Ratio of total indebtedness to adjusted EBITDA		2.5
Exchangeable Notes [Member] | Clearwire Communications LLC [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross								629,000,000
Debt instrument, interest rate, stated percentage								8.25%
Total cash consideration payable upon an exchange of all principal amount of notes outstanding								444,000,000
Secured Notes [Member] | Clearwire Communications LLC [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Principal amount of notes with the right to require the Company to repurchase on change of control		300,000,000
Secured Notes [Member] | iPCS Inc Secured Notes [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Repayments of long-term debt	181,000,000
Senior Notes [Member] | Sprint Communications Inc. Guaranteed Notes due 2021 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage										7.625%	7.25%
Debt instrument, face amount										1,500,000,000	2,250,000,000
Senior Notes [Member] | Sprint Corporation 7.875% [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage											7.875%
Debt instrument, face amount											4,250,000,000
Senior Notes [Member] | Sprint Corporation 7.125% [Member] [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage												7.125%
Debt instrument, face amount												2,500,000,000
Line of Credit [Member] | Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, annual principal payment		254,000,000
Line of Credit [Member] | Finnvera Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity													800,000,000
Debt instrument, annual principal payment		28,000,000
Number of tranches													3
Line of Credit [Member] | K-sure Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity													750,000,000
Number of tranches													3
Line of Credit [Member] | Delcredere / Ducroire (D/D) Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity													250,000,000
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility expires in 2018 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity														3,300,000,000
Line of credit facility, remaining borrowing capacity		2,800,000,000
Letter of Credit [Member] | Unsecured Revolving Credit Facility expires in 2018 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Letters of credit outstanding, amount		470,000,000
Successor [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest costs capitalized		56,000,000		13,000,000		30,000,000
Cash interest payments		2,300,000,000		559,000,000		1,000,000,000
Senior notes weighted average effective interest rate		6.10%		6.20%		6.40%
Successor [Member] | Exchangeable Notes [Member] | Clearwire Communications LLC [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		629,000,000	[1]	629,000,000	[1]
Debt instrument, interest rate, stated percentage		8.25%	[1]
Successor [Member] | Secured Notes [Member] | Clearwire Communications LLC [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		300,000,000	[1]	300,000,000	[1]
Debt instrument, interest rate, stated percentage		14.75%	[1]
Successor [Member] | Secured Notes [Member] | iPCS Inc Secured Notes [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		0		181,000,000
Successor [Member] | Senior Notes [Member] | Sprint Corporation [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		10,500,000,000		9,000,000,000
Successor [Member] | Senior Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		9,280,000,000		9,280,000,000
Successor [Member] | Line of Credit [Member] | Export Development Canada Credit Facilities [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, amount outstanding		800,000,000		500,000,000
Successor [Member] | Line of Credit [Member] | Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, amount outstanding		508,000,000
Successor [Member] | Line of Credit [Member] | Finnvera Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, amount outstanding		44,000,000
Successor [Member] | Line of Credit [Member] | K-sure Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, amount outstanding		58,000,000
Successor [Member] | Guaranteed Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		4,000,000,000		4,000,000,000
Successor [Member] | Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility expires in 2018 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, amount outstanding		0		0
Predecessor [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest costs capitalized							15,000,000	29,000,000	278,000,000
Cash interest payments							305,000,000	814,000,000	1,400,000,000
Senior notes weighted average effective interest rate							7.10%	8.90%	7.50%
Tranche three [Member] | Successor [Member] | Line of Credit [Member] | Export Development Canada Credit Facilities [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit, additional drawdown													300,000,000
Tranche one [Member] | Line of Credit [Member] | Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, amount outstanding		1,000,000,000
Tranche one [Member] | Line of Credit [Member] | Finnvera Secured Equipment Credit Facility [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Line of credit facility, amount outstanding		72,000,000
Parent [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		10,500,000,000
Unsecured Revolving Credit Facility expires in 2018 [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Ratio of total indebtedness to adjusted EBITDA through the quarter ended December 31, 2015															6.5
Ratio of total indebtedness to adjusted EBITDA through the quarter ended December 31, 2016															6.25
Required ratio of total indebtedness to adjusted EBITDA for each fiscal quarter ending thereafter through expiration of the revolving credit facility															6.0
Minimum required cash remaining on hand for operations as part of covenants															$ 2,000,000,000

[1] (1)Notes of Clearwire Communications LLC are also direct obligations of Clearwire Finance, Inc. and are guaranteed by certain Clearwire subsidiaries.