Other Financial Data Schedule of Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Financial Data [Abstract]
Taxes receivable	$ 258	$ 111
Prepaid expenses	238	229
Deferred project costs	102	98
Deferred tax assets	81	93
Other	32	32
Other Assets, Current	$ 711	$ 563