Long-term Financing and Sales of Receivables - Sales Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 31, 2018
Receivables [Abstract]
Accounts receivable sales proceeds	$ 3	$ 22	$ 27	$ 76
Long-term receivables sales proceeds	55	15	76	28
Total proceeds from receivable sales	58	$ 37	103	$ 104
Servicing obligations for long-term receivables	$ 971		$ 971		$ 970