Consolidated Statements Of Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2011	$ 256,997	$ 4,773,383	$ 226,721	$ (386,963)	$ (415,001)	$ 13,997	$ 4,469,134
Balance (in shares) at Dec. 31, 2011	1,027,986,000				(32,858,000)
Stock plans		(37,867)			46,423		8,556
Stock plans (in shares)					3,325,000
Dividends on common stock			(299,547)				(299,547)
Net income			111,757			12,358	124,115
Other comprehensive income, net of tax				12,142			12,142
Distributions						(11,000)	(11,000)
Balance at Sep. 30, 2012	256,997	4,735,516	38,931	(374,821)	(368,578)	15,355	4,303,400
Balance (in shares) at Sep. 30, 2012	1,027,986,000				(29,533,000)
Stock plans		3,285			(15)		3,270
Stock plans (in shares)					(43,000)
Dividends on common stock		(99,238)	(605)				(99,843)
Net income			24,879			4,320	29,199
Other comprehensive income, net of tax				(108,755)			(108,755)
Distributions						(8,000)	(8,000)
Balance at Dec. 31, 2012	256,997	4,639,563	63,205	(483,576)	(368,593)	11,675	4,119,271
Balance (in shares) at Dec. 31, 2012	1,027,986,000				(29,576,000)		998,410,000
Stock plans		(22,268)			30,679		8,411
Stock plans (in shares)					1,107,000
Dividends on common stock		(299,822)					(299,822)
Net income			45,080			2,643	47,723
Pension settlement costs, net of tax				24,992			24,992
Other comprehensive income, net of tax				19,805			19,805
Distributions						(6,400)	(6,400)
Sale of Mohave partnership interest						(7,918)	(7,918)
Balance at Sep. 30, 2013	$ 256,997	$ 4,317,473	$ 108,285	$ (438,779)	$ (337,914)		$ 3,906,062
Balance (in shares) at Sep. 30, 2013	1,027,986,000				(28,469,000)		999,517,000