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Long-term Financing and Sales of Receivables - Sales Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Receivables [Abstract]          
Accounts receivable sales proceeds $ 99 $ 8 $ 179 $ 15  
Long-term receivables sales proceeds 55 39 123 173  
Total proceeds from receivable sales 154 $ 47 302 $ 188  
Servicing obligations for long-term receivables $ 780   $ 780   $ 774