Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 1,753	$ 1,582	$ 2,946
Postretirement and postemployment plans
Change in actuarial loss and other	296	(97)	16
Income tax benefit (provision) on postretirement and postemployment plans	(112)	35	20
Postretirement and postemployment plans, net of tax	184	(62)	36
Derivative hedges
Net unrecognized gain	1	1	9
Income tax provision on derivative hedges	0	0	(4)
Derivative hedges, net of tax	1	1	5
Foreign currency translation and other
Unrealized gain (loss)	(3)	1	(1)
Income tax benefit (provision) on foreign currency translation and other	1	(3)	0
Foreign currency translation and other, net of tax	(2)	(2)	(1)
Other comprehensive income (loss)	183	(63)	40
Comprehensive income	$ 1,936	$ 1,519	$ 2,986