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Accounts Receivable and Finance Receivables - Allowance for losses on finance receivables on an individual and on a collective basis (Details) - USD ($)
$ in Millions
Jul. 01, 2017
Dec. 31, 2016
Finance receivables    
Allowance based on collective evaluation $ 28 $ 30
Allowance based on individual evaluation 7 11
Finance receivables evaluated collectively 670 727
Finance receivables evaluated individually $ 78 $ 120