Acquisitions (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Cost of acquisition paid in cash		$ 69	$ 0
NSS and Minmetal [Member]
Business Acquisition [Line Items]
Total cost of acquisitions	$ 76	76
Cost of acquisition paid in cash	69	69
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	63	63
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	43	43
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	122	122
Business Acquisition, Purchase Price Allocation, Other Noncurrent Assets	1	1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	34	$ 34
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 27