Other Financial Data Schedule of Non-current Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Financial Data [Abstract]
Prepaid pension	$ 897	$ 933
Deferred project costs	237	250
Deferred tax assets	146	144
Investments	143	143
Taxes receivable	57	101
Other	198	233
Total	$ 1,678	$ 1,804