Plant and Equipment and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Plant and Equipment and Goodwill [Abstract]
Plant and equipment, at cost	$ 3,523		$ 3,523		$ 3,580
Accumulated depreciation	(1,709)		(1,709)		(1,616)
Total plant and equipment, net	1,814		1,814		$ 1,964
Goodwill [Roll Forward]
Balance at beginning of the period			2,461
Impairment of goodwill (Note 3)	0	$ 0	(517)	$ (40)
Adjustments to the purchase price allocation for prior year acquisitions			(12)
Translation effect of currency changes and other			(52)
Balance at end of the period	$ 1,880		$ 1,880