Other Financial Data Schedule of Other Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Other Financial Data [Abstract]
Taxes receivable	$ 220	$ 99
Deferred tax assets	204	212
Prepaid expenses	175	164
Deferred project costs	106	102
Other	26	25
Total	$ 731	$ 602