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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