Other Items - Net Interest And Other Financial Income (Costs) (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
Interest:
Interest income	$ 1	$ 3	$ 3	$ 5
Interest expense	(49)	(49)	(98)	(97)
Interest capitalized	7	4	13	8
Total net interest	(41)	(42)	(82)	(84)
Other:
Net foreign currency gains (losses)	(1)	2	(1)	1
Bank service and other fees	(6)	(5)	(11)	(10)
Total other	(7)	(3)	(12)	(9)
Net interest and other financial income (costs)	$ (48)	$ (45)	$ (94)	$ (93)