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Acquisitions and Related Transactions Acquisitions (Schedule of Discontinued Operations) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal Group, Including Discontinued Operations, Loss on Debt Extinguishment       $ 20 $ 0
Disposal Group, Including Discontinued Operation, Revenue       349 6,964
Disposal Group, Including Discontinued Operation, Costs of Goods Sold       305 5,806
Disposal Group, Including Discontinued Operation, Operating Expense       61 763
Disposal Group, Including Discontinued Operation, Depreciation and Amortization       0 34
Disposal Group, Including Discontinued Operation, General and Administrative Expense       7 168
Impairment of Long-Lived Assets to be Disposed of       0 285
Goodwill impairment $ 12 $ 9 $ 21 378  
Disposal Group, Including Discontinued Operations, Total Costs and Expenses       373 7,056
Disposal Group, Including Discontinued Operation, Operating Income (Loss)       (24) (92)
Disposal Group, Including Discontinued Operation, Interest Expense       2 36
Disposal Group, Including Discontinued Operation, Other Expense       61 1
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax       (107) (129)
Discontinued Operation, Tax Effect of Discontinued Operation       158 48
Loss from discontinued operations     $ 0 (265) (177)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent       $ (10) $ (6)