Other Financial Data Schedule of Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Financial Data [Abstract]
Prepaid expenses	$ 219	$ 229
Taxes receivable	130	111
Deferred project costs	102	98
Deferred tax assets	81	93
Other	45	32
Other Assets, Current	$ 577	$ 563