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Pension and Other Postretirement Employee Benefit Plans (Details) (Textuals) (USD $)	Mar. 31, 2013	Dec. 31, 2012
U.S. Defined Benefit Pension And OPEB Plans [Member]
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	$ 15,200,000,000	$ 14,600,000,000
Defined Benefit Pension Plans, U.S.
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined benefit pension plan, non-U.S., expected contribution	0
Other Pension Plans, Defined Benefit
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined benefit pension plan, non-U.S., expected contribution	39,000,000
Defined Benefit Pension Plans, Non-U.S.
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	3,300,000,000	3,300,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	39,000,000
OPEB Plans \| Contractually Required Payments
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 2,000,000

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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