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Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Carrying amount of liabilities $ 7,717     $ 7,717   $ 8,107
Document Fiscal Year Focus       2017    
Goodwill impairment charge 0   $ 0 $ 290 $ 0  
Technology Solutions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Goodwill impairment charge   $ 290   290    
After-tax goodwill impairment   $ 282   282    
Fair value, measurements, recurring | Fair value, inputs, level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Estimated fair values of liabilities 8,000     8,000   8,600
Fair value, measurements, recurring | Fair value, inputs, level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investments in money market funds $ 600     $ 600   $ 2,400