Discontinued Operations Balance Sheet Amounts of Discontinued Operations (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventories, net	$ 456		$ 426
Other current assets	62	$ 89	81
Assets held for sale	6		3,313
Assets Held-for-sale, Not Part of Disposal Group			3,313
Capital Lease Obligations	2		3
Property and equipment, net	1,520	1,557	1,557
Goodwill	1,469		1,430
Intangible assets, net	659	668	768
Other noncurrent assets	123	84	45
Other noncurrent liabilities	136	$ 126	125
Liabilities associated with assets held for sale	0		75
Discontinued Operations [Member]
Cash	0		21
Inventories, net	0		149
Other current assets	0		16
Capital Lease Obligations	0		21
Property and equipment, net	6		1,851
Goodwill	0		796
Intangible assets, net	0		477
Other noncurrent assets	0		3
Other noncurrent liabilities	$ 0		$ 54