Long-Term Debt, Financing and Capital Lease Obligations (Schedule of Long-term Debt Instruments) (Details) (USD $) In Millions, unless otherwise specified					6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended				6 Months Ended				6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended
	Jul. 10, 2013 Exchangeable notes [Member] Clearwire Communications LLC [Member]	Sep. 30, 2014 Line of Credit [Member] Secured Equipment Credit Facility [Member]	Sep. 30, 2014 Successor [Member]	Mar. 31, 2014 Successor [Member]	Sep. 30, 2014 Successor [Member] Senior Notes [Member] Sprint Corporation [Member]	Mar. 31, 2014 Successor [Member] Senior Notes [Member] Sprint Corporation [Member]	Sep. 30, 2014 Successor [Member] Senior Notes [Member] Sprint Capital Corporation [Member]	Mar. 31, 2014 Successor [Member] Senior Notes [Member] Sprint Capital Corporation [Member]	Sep. 30, 2014 Successor [Member] Senior Notes [Member] Sprint Nextel Corporation Guaranteed Notes [Member]	Mar. 31, 2014 Successor [Member] Senior Notes [Member] Sprint Nextel Corporation Guaranteed Notes [Member]	Sep. 30, 2014 Successor [Member] Guaranteed notes [Member] Sprint Nextel Corporation Guaranteed Notes [Member]	Mar. 31, 2014 Successor [Member] Guaranteed notes [Member] Sprint Nextel Corporation Guaranteed Notes [Member]	Sep. 30, 2014 Successor [Member] Secured Debt [Member] iPCS Inc Secured Notes [Member]	Mar. 31, 2014 Successor [Member] Secured Debt [Member] iPCS Inc Secured Notes [Member]	Sep. 30, 2014 Successor [Member] Secured Debt [Member] Clearwire Communications LLC [Member]		Mar. 31, 2014 Successor [Member] Secured Debt [Member] Clearwire Communications LLC [Member]		Sep. 30, 2014 Successor [Member] Exchangeable notes [Member] Clearwire Communications LLC [Member]		Mar. 31, 2014 Successor [Member] Exchangeable notes [Member] Clearwire Communications LLC [Member]		Sep. 30, 2014 Successor [Member] Revolving Credit Facility [Member] Unsecured Revolving Credit Facility expires in 2018 [Member]	Mar. 31, 2014 Successor [Member] Revolving Credit Facility [Member] Unsecured Revolving Credit Facility expires in 2018 [Member]	Sep. 30, 2014 Successor [Member] Line of Credit [Member] Export Development Canada Credit Facilities [Member]	Mar. 31, 2014 Successor [Member] Line of Credit [Member] Export Development Canada Credit Facilities [Member]	Sep. 30, 2014 Successor [Member] Line of Credit [Member] Secured Equipment Credit Facility [Member]	Mar. 31, 2014 Successor [Member] Line of Credit [Member] Secured Equipment Credit Facility [Member]	Sep. 30, 2014 Successor [Member] Financing Obligation [Member]	Mar. 31, 2014 Successor [Member] Financing Obligation [Member]	Sep. 30, 2014 Successor [Member] Capital Lease Obligations [Member]	Mar. 31, 2014 Successor [Member] Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum					7.12%		6.88%		6.00%		7.00%																				2.35%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum					7.88%		8.75%		11.50%		9.00%																				10.52%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate													3.49%										2.75%		3.58%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																											2.03%		6.09%
Debt Instrument, Interest Rate, Stated Percentage	8.25%														14.75%				8.25%
Maturity Date Range, Start					Sep. 15, 2021		May 01, 2019		Dec. 01, 2016		Nov. 15, 2018																				Dec. 30, 2015
Maturity Date Range, End					Dec. 15, 2024		Mar. 15, 2032		Nov. 15, 2022		Mar. 01, 2020												Feb. 28, 2018		Dec. 15, 2015		Mar. 30, 2017				Nov. 21, 2023
Debt Instrument, Maturity Date													May 01, 2014		Dec. 01, 2016				Dec. 01, 2040										Sep. 30, 2021
Line of Credit Facility, Amount Outstanding		$ 1,000																					$ 0	$ 0	$ 500	$ 500	$ 635	$ 762
Long-term Debt, Gross	629				9,000	9,000	6,204	6,204	9,280	9,280	4,000	4,000	0	181	300	[1]	300	[1]	629	[1]	629	[1]							301	327	158	187
Debt Instrument, Unamortized Premium (Discount), Net			1,259	1,408
Current and Long-term Debt, Financing and Capital Lease Obligations			32,266	32,778
Long Term Debt Financing And Capital Lease Obligations, Current portion			(808)	(991)
Long-term debt, financing and capital lease obligations			$ 31,458	$ 31,787

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