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Acquisitions Discontinued Operations - Balance Sheet Data (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash and cash equivalents $ 0 $ 21
Inventories 0 149
Other current assets 0 16
Property, plant and equipment, net 6 1,851
Goodwill 0 796
Intangible assets, net 0 477
Other non-current assets, net 0 3
Total assets classified as held for sale in the Consolidated Balance Sheet 6 3,313
Total liabilities classified as held for sale in the Consolidated Balance Sheet $ 0 75
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent   $ 75