Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Comprehensive Income [Abstract]
Net (loss) income	$ (130)	$ 804	$ 629
Other comprehensive (loss) income:
Net foreign currency translation adjustment	(40)	(74)	126
Net change in postretirement benefit plans, net of tax (expense) of $399, $(19) and $ (88), respectively	(508)	29	141
Net change in unrealized gains on investment securities, net of tax (expense) benefit of $8, $0 and $(7), respectively	(12)	(1)	12
Other comprehensive (loss) income	(560)	(46)	279
Other comprehensive (loss) income	821	(46)	279
Comprehensive (loss) income	(690)	758	908
Net change in postretirement benefit plans, net of tax:
Prior service benefit (cost) from plan amendment, net of tax (expense) benefit of $(1), $1 and $(1), respectively	2	(2)	2
Net actuarial (loss) gain arising during the period, net of tax benefit(expense) of $443, $14 and $(61), respectively	(580)	(23)	95
Unrealized changes in postretirement benefit plans, net of tax	(578)	(25)	97
Amortization of prior service costs, net of tax benefit of $(1), $(1) and $(2), respectively	2	1	5
Amortization of net actuarial loss, net of tax benefit of $(42), $(33) and $(24), respectively	68	53	39
Total amortization from accumulated other comprehensive loss into net period benefit cost, net of tax	70	54	44
Net change in postretirement benefit plans, net of tax	(508)	29	141
Net change in unrealized gains on investment securities, net of tax:
Unrealized holding (losses) gains arising during period, net of tax expense of $2, $(3) and $(7), respectively	(2)	4	12
Realized gains arising during the period, net of tax expense of $6, $3 and $0, respectively	(10)	(5)	0
Net change in unrealized gains on investment securities, net of tax	$ (12)	$ (1)	$ 12