Acquisitions and Dispositions Assets Held for Sale table (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		$ 639	$ 916	$ 2,100	$ 2,700
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, before Income Tax		136	$ 70	336	$ 260
Disposal Group, Including Discontinued Operation, Depreciation and Amortization		86		158
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current		1,193		1,193
Disposal Group, Including Discontinued Operation, Inventory, Current		563		563
Disposal Group, Including Discontinued Operation, Goodwill, Current		271		271
Disposal Group, Including Discontinued Operation, Intangible Assets, Current		55		55
Assets held for sale		2,082		2,082		$ 0
Disposal Group, Including Discontinued Operation, Postretirement Plan Benefit Obligation, Current	[1]	50		50
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	[1]	6		6
Disposal Group, Including Discontinued Operation, Liabilities, Current		$ 56		$ 56

[1] (a) Liabilities held for sale are classified within “Other current liabilities” on our condensed consolidated balance sheet as of September 30, 2015.