Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other Comprehensive Income (Loss):
Tax on foreign currency translation	$ 0	$ 0	$ 0	$ 0
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	2	0	6	2
Tax on net actuarial losses	0	0	7	1
Tax on immediate recognition of prior service costs and unrecognized gains and losses due to curtailments, settlements and divestitures	0	0	0	1
Tax on prior service credit from plan amendments	5	0	3	0
Tax on deferred derivative gains (losses)	0	0	0	0
Tax on reclassification adjustment for amounts recognized in income	(1)	0	(3)	0
Tax on unrealized investment gains (losses)	$ 0	$ 0	$ 0	$ 0