Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net earnings (loss)	$ 203	$ 160	$ 345	$ 174
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	0	(2)	0	1
Foreign currency translation	29	(28)	87	(59)
Unrealized gain (loss) on interest rate swaps	0	6	9	3
Pension and postretirement benefits	5	2	8	6
Total other comprehensive income (loss), net of tax	34	(22)	104	(49)
Comprehensive income (loss)
Net earnings (loss)	203	160	345	174
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on marketable securities	0	(2)	0	1
Foreign currency translation	29	(28)	87	(59)
Unrealized gain (loss) on interest rate swaps	0	6	9	3
Pension and postretirement benefits	5	2	8	6
Total other comprehensive income (loss), net of tax	34	(22)	104	(49)
Total comprehensive income (loss), net of tax	237	138	449	125
Comprehensive (income) loss attributable to noncontrolling interests	0	0	0	0
Comprehensive income (loss) attributable to Celanese Corporation	$ 237	$ 138	$ 449	$ 125