Emplyee Benefit Plans, Aggregate Projected Benefit Obligation (Details) (Pension Plans [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Pension Plans [Member]
The total projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for our Pension Plans for which the accumulated benefit obligation exceeded the fair value of plan assets
Projected benefit obligation	$ 244	$ 231
Accumulated benefit obligation	(189)	(192)
Fair value of plan assets	$ 40	$ 44

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