Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income Loss) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income (Loss) [Abstract]
Foreign currency translation adjustments (net of deferred tax liability of $14 and $10 in 2011 and 2010, respectively)	$ (42)	$ 62
Net unrealized investment gains (net of deferred tax liability of $1 and $5 in 2011 and 2010, respectively)	6	11
Net charges related to pension / retiree plans (net of deferred tax asset of $1,508 and $1,173 in 2011 and 2010, respectively)	(3,152)	(2,373)
Accumulated other comprehensive income (loss)	(3,188)	(2,300)
Foreign currency translation adjustments, tax expense	14	10
Net unrealized investment gains, Tax portion	1	5
Net charges related to pension / retiree plans, Tax portion	$ 1,508	$ 1,173