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Additional Financial Information (Other Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Other current assets |  |
Prepaid expenses and other | $ 24 | $ 26
Product inventory | 27 | 21
Tax credits receivable | 208 | 190
Other current assets | 259 | 237
Other non-current assets |  |
Prepaid expenses and other | 37 | 32
Accounts receivable | 262 | 222
Tax credits receivable | 106 | 67
Other non-current assets | $ 405 | $ 321

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