Leases Cash Flows Arising from Lease Transactions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 28, 2019	Sep. 28, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash inflows/(outflows) from operating leases	$ (48)	$ (146)
Operating cash inflows/(outflows) from finance leases	(2)	(5)
Financing cash inflows/(outflows) from finance leases	(7)	(20)
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	4	31
Finance leases	$ 8	$ 8