Pension and Other Postretirement Benefit Plans (Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Pre-Tax) in 2011) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total recognized in other comprehensive income (pre-tax)	$ (177)	$ 24	$ (109)
United States Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial (gain) loss	285
Actuarial (loss) gain recognized during the year	(31)
Current year prior service cost (credit)	0
Prior service credit (cost) recognized during the year	3
Total recognized in other comprehensive income (pre-tax)	257
Total recognized in net periodic benefit costs and other comprehensive income (pre-tax)	285
Foreign Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial (gain) loss	4
Actuarial (loss) gain recognized during the year	(6)
Current year prior service cost (credit)	0
Prior service credit (cost) recognized during the year	(1)
Total recognized in other comprehensive income (pre-tax)	(3)
Total recognized in net periodic benefit costs and other comprehensive income (pre-tax)	21
Other Postretirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year actuarial (gain) loss	(6)
Actuarial (loss) gain recognized during the year	2
Current year prior service cost (credit)	(148)
Prior service credit (cost) recognized during the year	75
Total recognized in other comprehensive income (pre-tax)	(77)
Total recognized in net periodic benefit costs and other comprehensive income (pre-tax)	$ (115)