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Employee Retirement Plans (Projected Benefit Obligation And Accumulated Benefit Obligation For Pension Plans) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Employee Retirement Plans [Abstract]
Projected benefit obligation	$ 3,371	$ 388
Accumulated benefit obligation	3,196	360
Fair value of plan assets	$ 2,702	$ 14

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