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Related Party Transactions (Brightstar) (Details) (Successor [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Brightstar Subsidiary [Member]
   
Related Party Transaction [Line Items]    
Accounts payable $ 16us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarSubsidiaryMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ 205us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarSubsidiaryMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Inventories, related party 410s_Inventoriesrelatedparty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarSubsidiaryMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
266s_Inventoriesrelatedparty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarSubsidiaryMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Brightstar [Member]
   
Related Party Transaction [Line Items]    
Accounts receivable 430us-gaap_AccountsReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0us-gaap_AccountsReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Accounts payable 96us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Revenue from related parties 1,818us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
[1]  
Related party costs $ 1,887us-gaap_RelatedPartyCosts
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= s_BrightstarMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
[1]  
[1] (1)Amounts for all other reported periods were immaterial.