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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product revenue	$ 1,550	$ 1,663	$ 4,604	$ 4,734
Operating Income (Loss)	125	199	128	489
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	72	150	(21)	351
Income tax (benefit) expense	(15)	31	(20)	78
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	87	119	(1)	273
Net income (loss)	86	119	(39)	278
Net (loss) income attributable to parent	$ 84	$ 118	$ (41)	$ 277
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.62	$ 0.87	$ (0.33)	$ 1.43
Income (Loss) from Continuing Operations, Per Diluted Share	0.57	0.77	(0.33)	1.37
Basic (in dollars per share)	0.61	0.87	(0.65)	1.47
Diluted (in dollars per share)	$ 0.56	$ 0.77	$ (0.65)	$ 1.41
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of products	$ 461		$ 1,330
Operating Income (Loss)	117		112
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	64		(37)
Income tax (benefit) expense	(18)		(25)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	82		(12)
Net income (loss)	81		(50)
Net (loss) income attributable to parent	$ 79		$ (52)
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.58		$ (0.42)
Income (Loss) from Continuing Operations, Per Diluted Share	0.54		(0.42)
Basic (in dollars per share)	0.57		(0.74)
Diluted (in dollars per share)	$ 0.53		$ (0.74)
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]
Cost of products	$ (12)		$ (14)
Operating Income (Loss)	(8)		(16)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(8)		(16)
Income tax (benefit) expense	(3)		(5)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(5)		(11)
Net income (loss)	(5)		(11)
Net (loss) income attributable to parent	$ (5)		$ (11)
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.04)		$ (0.09)
Income (Loss) from Continuing Operations, Per Diluted Share	(0.03)		(0.09)
Basic (in dollars per share)	(0.04)		(0.09)
Diluted (in dollars per share)	$ (0.03)		$ (0.09)
Product
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product revenue	$ 534	$ 657	$ 1,585	$ 1,829
Cost of products	473	$ 528	1,344	$ 1,430
Product | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product revenue	514		1,555
Product | 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	$ (20)		$ (30)