Other Financial Data - Schedule of Other Current Assets (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Other Financial Data [Abstract]
Taxes receivable	$ 122	$ 94
Deferred tax assets	232	232
Prepaid expenses	168	130
Deferred project costs	92	92
Other	8	14
Total	$ 622	$ 562