Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Long-Term Asset Allocation Ranges) (Details)	12 Months Ended
	Dec. 31, 2012
Minimum [Member]
Domestic and global equities	15.00%
Fixed income and convertible securities	37.00%
Hedge Funds	5.00%
Maximum [Member]
Domestic and global equities	48.00%
Fixed income and convertible securities	80.00%
Hedge Funds	15.00%