Other Financial Data Schedule of Non-current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Other Financial Data [Abstract]
Prepaid pension	$ 953	$ 933
Deferred project costs	232	250
Deferred tax assets	164	144
Investments	142	143
Taxes receivable	63	101
Other	201	233
Total	$ 1,755	$ 1,804