Defined Benefit Pension And Other Postretirement Plans (Summary Of Assumptions Used To Determine Benefit Obligations And Net Periodic Benefit Cost) (Detail)	12 Months Ended						1 Months Ended		12 Months Ended
	Dec. 31, 2013 Pension Benefits [Member]		Dec. 31, 2012 Pension Benefits [Member]		Dec. 31, 2011 Pension Benefits [Member]		Jan. 31, 2014 Pension Benefits [Member] Scenario, Forecast [Member]		Dec. 31, 2013 Other Benefits [Member]		Dec. 31, 2012 Other Benefits [Member]		Dec. 31, 2011 Other Benefits [Member]
Weighted-average assumptions used to determine benefit obligation:
Weighted-average assumptions used to determine benefit obligation, Discount rate	4.30%		3.45%		4.30%				4.95%		4.05%		4.65%
Weighted-average assumptions used to determine benefit obligation, Rate of compensation increase	3.70%		5.00%		5.00%				3.70%		5.00%		5.00%
Weighted average assumptions used to determine net periodic benefit cost:
Weighted average assumptions used to determine net periodic benefit cost, Discount rate	3.88%		4.06%		4.98%				4.11%		4.54%		5.55%
Weighted average assumptions used to determine net periodic benefit cost, Expected long-term return on plan assets	7.50%	[1]	7.50%	[1]	8.50%	[1]	7.00%	[1]	0.00%	[1]	0.00%	[1]	0.00%	[1]
Weighted average assumptions used to determine net periodic benefit cost, Rate of compensation increase	5.00%		5.00%		5.00%				5.00%		5.00%		5.00%

[1] Effective January 1, 2014, the expected long-term rate of return on plan assets changed from 7.50 percent to 7.00 percent