Other Earnings (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Income and Expenses [Abstract]
Royalty income	$ 51	$ 55	$ 58
Share of net earnings of equity affiliates (See Note 5)	11	37	45
Gain on sale of assets	4	12	8
Other	83	73	69
Total	$ 149	$ 177	$ 180