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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
Sep. 30, 2017
Dec. 31, 2016
Finance receivables    
Allowance based on collective evaluation $ 27 $ 30
Allowance based on individual evaluation 7 11
Finance receivables evaluated collectively 657 727
Finance receivables evaluated individually $ 74 $ 120