Consolidated Statements of Comprehensive Income Parenthetical (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other comprehensive income:
Tax expense on FX adjustment	$ 0	$ 0	$ 0
Pension and other postretirement benefits:
Tax on gain(loss) arising during the year	101	5	(132)
Tax on gain(loss) reclassified into income	2	3	(2)
Derivative instruments designated and qualifying as cash flow hedges:
Tax on gain(loss) arising during the year	(11)	1	(44)
Tax on gain(loss) reclassified into income	$ 1	$ 62	$ 72