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Installment Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment billing maximum payment term 24 months  
Installment receivables, gross   $ 1,725
Deferred interest   (139)
Installment receivables, net of deferred interest   1,586
Allowance for credit losses   (190)
Installment receivables, net   1,396
Prime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   1,329
Subprime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   396
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, net   1,035
Other Noncurrent Assets [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, net   361
Unbilled Revenues [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   1,602
Unbilled Revenues [Member] | Prime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   1,243
Unbilled Revenues [Member] | Subprime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   359
Billed Revenues [Member] | Billed receivables, current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   87
Billed Revenues [Member] | Billed receivables, current [Member] | Prime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   65
Billed Revenues [Member] | Billed receivables, current [Member] | Subprime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   22
Billed Revenues [Member] | Billed receivables, past due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   36
Billed Revenues [Member] | Billed receivables, past due [Member] | Prime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   21
Billed Revenues [Member] | Billed receivables, past due [Member] | Subprime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross   $ 15