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Installment Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment billing maximum payment term 24 months  
Installment receivables, gross $ 2,270  
Deferred interest (207)  
Installment receivables, net of deferred interest 2,063  
Allowance for credit losses (299)  
Installment receivables, net 1,764  
Prime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 1,595  
Subprime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 675  
Accounts and notes receivable, Net [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, net 1,195  
Other Noncurrent Assets [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, net 569  
Unbilled Revenues [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 2,120  
Unbilled Revenues [Member] | Prime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 1,501  
Unbilled Revenues [Member] | Subprime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 619  
Billed Revenues [Member] | Billed receivables, current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 110  
Billed Revenues [Member] | Billed receivables, current [Member] | Prime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 74  
Billed Revenues [Member] | Billed receivables, current [Member] | Subprime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 36  
Billed Revenues [Member] | Billed receivables, past due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 40  
Billed Revenues [Member] | Billed receivables, past due [Member] | Prime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 20  
Billed Revenues [Member] | Billed receivables, past due [Member] | Subprime [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Installment receivables, gross 20  
Financing Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Bad debt expense $ 61 $ 93