Pension Benefit Plans and Other Postretirement Benefits (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefit Plans and Other Postretirement Benefits
Payments to the trust as required by the bargaining agreements are based upon specified amounts per hour worked	$ 6	$ 6	$ 6
U.S Postretirement Benefit Plans
Weighted average assumed health care cost trend (in percent)
Health care cost trend rate assumed for next year (as a percent)	8.00%	8.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) (as a percent)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2019	2019
Effect of one-percentage-point change in assumed health care cost trend rates (in percent)
One-Percentage-Point Increase, effect on accumulated postretirement benefit obligations	5
One-Percentage-Point Decrease, effect on accumulated postretirement benefit obligations	(5)
Non-U.S. Postretirement Benefit Plans
Weighted average assumed health care cost trend (in percent)
Health care cost trend rate assumed for next year (as a percent)	6.00%	7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) (as a percent)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2014	2014
Effect of one-percentage-point change in assumed health care cost trend rates (in percent)
One-Percentage-Point Increase, effect on total of service and interest cost	1
One-Percentage-Point Decrease, effect on total of service and interest cost	(1)
One-Percentage-Point Increase, effect on accumulated postretirement benefit obligations	16
One-Percentage-Point Decrease, effect on accumulated postretirement benefit obligations	$ (13)

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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