Discontinued Operations Balance Sheet Amounts of Discontinued Operations (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Accounts receivable, net	$ 398	$ 539
Inventories, net	356	385
Other current assets	91	72
Assets Held-for-sale, Not Part of Disposal Group, Current	4,194	291
Property and equipment, net	1,155	1,188
Goodwill	1,032	1,050
Intangible assets, net	786	752
Other noncurrent assets	54	64
Assets held-for-sale, noncurrent	0	4,258
Accrued expenses and other current liabilities	352	372
Liabilities held for sale, current	68	0
Other noncurrent liabilities	106	96
Liabilities held-for-sale, noncurrent	0	68
Discontinued Operations, Held-for-sale [Member]
Accounts receivable, net	22	20
Inventories, net	186	188
Other current assets	82	83
Property and equipment, net	2,141	2,185
Goodwill	1,260	1,568
Intangible assets, net	501	503
Other noncurrent assets	2	2
Other noncurrent liabilities	$ 68	$ 68