Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Commitments [Line Items]
Operating Expenses	$ 622		$ 549	$ 1,813	$ 1,523
Lonza Group AG
Other Commitments [Line Items]
Remaining total commitments	1,188			1,188
Other Third Party Manufacturers
Other Commitments [Line Items]
Remaining total commitments	$ 20			$ 20
Restatement Adjustment [Member]
Other Commitments [Line Items]
Operating Expenses		$ 6