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Nonpension Postretirement and Postemployment Benefits (Health Care Cost Trend Rates) (Details) (Nonpension Postretirement [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Nonpension Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed health care cost trend rate	6.10%
Assumed health care cost trend rate by year 2015	4.50%
Effect on total of service and interest cost components, one percentage point increase	$ 9
Effect on total of service and interest cost components, one percentage point decrease	(7)
Effect on postretirement benefit obligation, one percentage point increase	122
Effect on postretirement benefit obligation, one percentage point decrease	$ (96)

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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