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Guarantees (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jul. 31, 2016
Jan. 31, 2016
Estimated product warranty liabilities    
Balance at beginning of period $ 11 $ 8
Additions 1 27
Deductions (4) (24)
Balance at end of period $ 8 11
SHIELD warranty charge   $ 26