Other Expense, Net - Other Expense, Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Expense Net [Abstract]
Regional administration	$ 16	$ 18	$ 31	$ 36
Community development	15	17	26	30
Restructuring and other	6	21	13	30
Western Australia power plant	1	7	7	11
Transaction/Acquisition costs				45
Other	13	14	26	24
Other expense, net	$ 51	$ 77	$ 103	$ 176