Retirement Benefits Plans - Components of Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
United States pension liabilities [Member]
Components of pension plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	$ 3,817	$ 2,899
Accumulated benefit obligation	3,639	2,762
Fair value of plan assets	2,607	1,664
Non-United States pension liabilities [Member]
Components of pension plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	1,405	990
Accumulated benefit obligation	1,300	925
Fair value of plan assets	$ 657	$ 446

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