Employee Benefit Plans (Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Qualified Pension Plans [Member]
Projected benefit obligation		$ 1,052
Accumulated benefit obligation		956
Fair value of plan assets		951
Non-Qualified Pension Plans [Member]
Projected benefit obligation	160	167
Accumulated benefit obligation	151	160
Fair value of plan assets

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.

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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.

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- 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.

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