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Postretirement Benefit Plans (Details 11)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Domestic equities [Member]
Asset allocation ranges
Actual allocation	33.00%	25.00%
Minimum range	30.00%	25.00%
Maximum range	40.00%	75.00%
Alternative investments [Member]
Asset allocation ranges
Actual allocation	0.00%	47.00%
Minimum range	0.00%	20.00%
Maximum range	0.00%	45.00%
International equities [Member]
Asset allocation ranges
Actual allocation	27.00%	18.00%
Minimum range	20.00%	10.00%
Maximum range	40.00%	45.00%
Fixed income [Member]
Asset allocation ranges
Actual allocation, Fixed income	35.00%	2.00%
Asset allocation, Fixed income, Minimum	25.00%	0.00%
Asset allocation, Fixed income, Maximum	45.00%	60.00%
Cash and other [Member]
Asset allocation ranges
Actual allocation, Cash and other	5.00%	8.00%
Asset allocation, Cash and other, Minimum	0.00%	0.00%
Asset allocation, Cash and other, Maximum	5.00%	30.00%

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The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date.

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The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date.

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