Accounting Policies and Basis of Presentations (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 29, 2019	Jan. 01, 2019
Supplemental Cash Flow Information
Non-cash acquisition of assets	$ 15
Operating lease ROU assets obtained in exchange for new operating lease liabilities	42
Finance lease ROU assets obtained in exchange for new finance lease liabilities	19
Cash paid for amounts included in the measurement of operating lease liabilities	66
Cash paid for amounts included in the measurement of finance lease liabilities	1
Goodwill and Other Intangible Assets
Intangible assets, net	63
Accumulated amortization	11
Recently issued accounting standards
ROU assets	453
Lease liabilities	489
ASU 2016-02
Recently issued accounting standards
ROU assets		$ 460
Lease liabilities		$ 498
CT&M
Goodwill and Other Intangible Assets
Change in carrying amount of goodwill	$ 2