Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 1,149	$ 383
Postretirement and postemployment plans
Change in actuarial loss and other	(30)	13
Income tax (provision) benefit on postretirement and postemployment plans	10	(5)
Postretirement and postemployment plans, net of tax	(20)	8
Foreign currency translation and other
Unrealized loss	0	(1)
Income tax benefit on foreign currency translation and other	0	0
Foreign currency translation and other, net of tax	0	(1)
Other comprehensive income (loss)	(20)	7
Comprehensive income	$ 1,129	$ 390