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Accounts Receivable and Finance Receivables - Rollforward of the allowance for losses on finance receivables (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 02, 2016
Apr. 04, 2015
Allowance for losses    
Beginning of period $ 48 $ 51
Provision for losses   1
Charge-offs (3)  
Recoveries 3 1
End of period $ 48 $ 53