Pension And Other Postretirement Benefit Plans (Narrative) (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plans contribution by the company	$ 17,000,000
Defined benefit plans contribution by the company	2,900,000	24,500,000
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plans contribution by the company	1,000,000
Defined benefit plans contribution by the company	$ 100,000	$ 1,000,000