Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Other Comprehensive Income (Loss):
Tax on foreign currency translation	$ 0	$ 1
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	2	3
Tax on net actuarial losses	0	0
Tax on deferred derivative losses	0	0
Tax on reclassification adjustment for amounts recognized in income	0	0
Tax on unrealized investment gains (losses)	$ 0	$ 0