Retirement Plans (Reconciliation Of The Change In AOCI For Defined-Benefit Retirement Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Pension Benefits [Member]
Compensation And Retirement Disclosure Line Items
Net actuarial (gain) loss	$ 1,189		$ 714
Prior service cost	16		23
Amortization of net actuarial (loss) gain from prior years	(173)		(87)
Amortization of prior service credit (cost)	40		41
Other	3	[1]	10	[1]
Change in AOCI, pre-tax	1,075		701
Other Post-Retirement Benefits [Member]
Compensation And Retirement Disclosure Line Items
Net actuarial (gain) loss	61		130
Prior service cost	3		38
Amortization of net actuarial (loss) gain from prior years	(4)		5
Amortization of prior service credit (cost)	(6)		(2)
Other			6	[1]
Change in AOCI, pre-tax	$ 54		$ 177

[1] Includes foreign exchange translation adjustments.