Compensation and Benefit Plans (Weighted Average Assumptions) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.75%	5.50%	6.00%
Expected long-term return on plan assets	7.00%	7.00%	7.00%
Assumed health care cost trend rates:
Current year	9.50%	9.75%	8.25%
Ultimate rate	5.25%	5.50%	5.50%
Year ultimate rate reached	2019	2019	2016
Pension Plans
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.50%	5.25%	6.00%
Rate of compensation increase	4.50%	5.00%	5.00%
Expected long-term return on plan assets	7.50%	7.50%	7.50%