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Acquisitions and Related Transactions Acquisitions (Schedule of Discontinued Operations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposal Group, Including Discontinued Operation, Revenue $ 6,964 $ 5,712 $ 6,030
Disposal Group, Including Discontinued Operation, Costs of Goods Sold 5,806 4,649 5,026
Disposal Group, Including Discontinued Operation, Operating Expense 763 744 705
Disposal Group, Including Discontinued Operation, Depreciation and Amortization 34 143 128
Disposal Group, Including Discontinued Operation, General and Administrative Expense 168 114 91
Goodwill, Impairment Loss 895 897  
Disposal Group, Including Discontinued Operations, Total Costs and Expenses 7,056 6,097 5,950
Disposal Group, Including Discontinued Operation, Operating Income (Loss) (92) (385) 80
Disposal Group, Including Discontinued Operation, Interest Expense 36 28 21
Disposal Group, Including Discontinued Operation, Other Expense 1 8 (2)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax (129) (421) 61
Discontinued Operation, Tax Effect of Discontinued Operation 48 41 23
Income (loss) from discontinued operations, net of income taxes (177) (462) [1] 38 [1]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents 21 16  
Disposal Group, Including Discontinued Operation, Inventory 149 150  
Disposal Group, Including Discontinued Operation, Other Assets, Current 16 11  
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 1,851 1,860  
Disposal Group, Including Discontinued Operation, Goodwill 796 1,068  
Disposal Group, Including Discontinued Operation, Intangible Assets 477 480  
Disposal Group, Including Discontinued Operation, Other Assets 3 3  
Disposal Group, Including Discontinued Operation, Assets 3,313 3,588  
Disposal Group, Including Discontinued Operation, Liabilities 75 48  
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent (6) (12) 1
Retail Divestment [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Goodwill, Impairment Loss $ 285 $ 447 $ 0
[1] * As adjusted. See Note 2.