Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 1,208	$ 1,258
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	266	200
Deferred Tax Assets, Tax Credit Carryforwards	99	102
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	39	34
Deferred Tax Assets, Inventory	129	75
Deferred Tax Assets, Other	346	252
Deferred Tax Assets, Valuation Allowance	1,887	1,738	$ 73
Deferred Tax Assets, Net of Valuation Allowance	200	183
Deferred Tax Liabilities, Property, Plant and Equipment	49	13
Deferred Tax Liabilities, Goodwill and Intangible Assets	131	212
Deferred Tax Liabilities, Tax Deferred Income	0	9
Deferred Tax Liabilities, Undistributed Foreign Earnings	0	0
Deferred Tax Liabilities, Other	71	25
Deferred Tax Liabilities, Gross	251	259
Deferred Tax Liabilities, Net	$ (51)	$ (76)