Leases - Maturities (Details) $ in Millions	Jun. 29, 2019 USD ($)
Maturities of operating lease liabilities
Remainder of 2019	$ 71
2020	113
2021	99
2022	74
2023	68
Thereafter	188
Total undiscounted lease payments	613
Less imputed interest	(124)
Total operating lease liability	489
Maturities of finance lease liabilities
Remainder of 2019	2
2020	3
2021	3
2022	3
2023	3
Thereafter	14
Total undiscounted lease payments, Finance Lease	28
Less imputed interest	(9)
Total finance lease liability	$ 19