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Employee Benefits (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension Plans with Projected Benefit Obligations in Excess of Plan Assets
Projected benefit obligation	$ 3,261	$ 2,895
Fair value of plan assets	2,103	2,265
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Accumulated benefit obligation	2,986	2,698
Fair value of plan assets	$ 2,066	$ 2,265

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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- Definition

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