Retirement Plans (Pension Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 10,555	$ 9,824
Accumulated benefit obligation	10,275	9,594
Fair value of plan assets	8,185	8,344
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	40	42
Accumulated benefit obligation	33	34
Fair value of plan assets	$ 2	$ 2

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details

- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details