Revenue Recognized Under Previous Guidance Accounting Pronouncements or Change in Accounting Principle (Statement of Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product revenue	$ 526	$ 554
Cost of products	420	424
Operating Income (Loss)	109	115
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	63	71
Income tax expense	7	14
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	56	57
Net income	21	57
Net Income (Loss) Attributable to Parent	$ 20	$ 57
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.36	$ (0.14)
Income (Loss) from Continuing Operations, Per Diluted Share	0.35	(0.14)
Basic (in dollars per share)	0.07	(0.14)
Diluted (in dollars per share)	$ 0.06	$ (0.14)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product revenue	$ 519
Cost of products	418
Operating Income (Loss)	104
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	58
Income tax expense	6
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	52
Net income	17
Net Income (Loss) Attributable to Parent	$ 16
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.33
Income (Loss) from Continuing Operations, Per Diluted Share	0.32
Basic (in dollars per share)	0.03
Diluted (in dollars per share)	$ 0.03
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product revenue	$ (7)
Cost of products	(2)
Operating Income (Loss)	(5)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(5)
Income tax expense	(1)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(4)
Net income	(4)
Net Income (Loss) Attributable to Parent	$ (4)
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.03)
Income (Loss) from Continuing Operations, Per Diluted Share	(0.03)
Basic (in dollars per share)	(0.04)
Diluted (in dollars per share)	$ (0.03)