Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Comprehensive Income (Loss):
Tax on foreign currency translation	$ 0	$ (1)	$ 0	$ 0
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	2	(1)	4	2
Tax on net actuarial losses	7	1	7	1
Tax on immediate recognition of prior service costs and unrecognized gains and losses due to curtailments and settlements	0	1	0	1
Tax on prior service cost from plan amendments	(2)	0	(2)	0
Tax on deferred derivative gains (losses)	0	0	0	0
Tax on reclassification adjustment for amounts recognized in income	(2)	0	(2)	0
Tax on unrealized investment gains (losses)	$ 0	$ 0	$ 0	$ 0