Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 383	$ 417
Postretirement and postemployment plans
Change in actuarial loss and other	13	13
Income tax provision on postretirement and postemployment plans	(5)	(5)
Postretirement and postemployment plans, net of tax	8	8
Foreign currency translation and other
Unrealized gain (loss)	(1)	1
Income tax provision on foreign currency translation and other	0	0
Foreign currency translation and other, net of tax	(1)	1
Other comprehensive income	7	9
Comprehensive income	$ 390	$ 426