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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

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