Employee Benefit Plans (Accumulated Benefit Obligation) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined benefit pension plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	$ 6,080	$ 5,441
Accumulated benefit obligation	6,079	5,394
Fair value of plan assets	$ 4,850	$ 4,492

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.

+ References+ Details