Leases - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 28, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease, option to extend term	5 years
Finance lease, option to extend term	5 years
Operating lease, termination period	1 year
Finance lease, termination period	1 year
Assets under finance leases, gross	$ 82
Accumulated depreciation under finance leases	11
Finance lease liabilities	25	$ 25
Right-of-use assets	$ 216	$ 226
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	1 year
Finance lease, remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	30 years
Finance lease, remaining lease term	30 years
Land | Minimum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	48 years
Land | Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term	90 years