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Employee Benefits - Pension Plans with Benefit Obligations in Excess of Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pension Plans with Projected Benefit Obligations in Excess of Plan Assets
Projected benefit obligation	$ 4,096	$ 3,261
Fair value of plan assets	2,321	2,103
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets
Accumulated benefit obligation	3,776	2,986
Fair value of plan assets	$ 2,321	$ 2,066

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