Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
OTHER EXPENSE, NET
Regional administration	$ 16	$ 14	$ 47	$ 45
Community development	11	8	27	34
Restructuring and other	12	19	26	32
Acquisition costs	7		15
Write-downs	3	5	6	18
Western Australia power plant	2	5	5	12
Other	6	12	22	38
Other expense, net	$ 57	$ 63	$ 148	$ 179