Leases - Maturities (Details) $ in Millions	Sep. 28, 2019 USD ($)
Maturities of operating lease liabilities
Remainder of 2019	$ 41
2020	117
2021	103
2022	77
2023	56
Thereafter	205
Total undiscounted lease payments	599
Less imputed interest	(120)
Total operating lease liability	479
Maturities of finance lease liabilities
Remainder of 2019	1
2020	6
2021	6
2022	6
2023	5
Thereafter	23
Total undiscounted lease payments	47
Less imputed interest	(13)
Total finance lease liability	$ 34