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		(34,582)			46,408		11,826
Stock plans (in shares)					3,282,000
Dividends on common stock		(99,238)	(300,152)				(399,390)
Net income			136,636			16,678	153,314
Other comprehensive income (loss), net of tax				(96,613)			(96,613)
Distributions						(19,000)	(19,000)
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
Stock plans		(18,671)			30,443		11,772
Stock plans (in shares)					1,052,000
Dividends on common stock		(299,836)	(99,932)				(399,768)
Net income			112,835			2,643	115,478
Pension settlement costs, net of tax				27,381			27,381
Other comprehensive income (loss), net of tax				195,665			195,665
Distributions						(6,400)	(6,400)
Sale of Mohave partnership interest						(7,918)	(7,918)
Balance at Dec. 31, 2013	256,997	4,321,056	76,108	(260,530)	(338,150)		4,055,481
Balance (in shares) at Dec. 31, 2013	1,027,986,000				28,524,000		999,462,000
Stock plans		(30,251)			44,244		13,993
Stock plans (in shares)					3,007,000
Dividends on common stock		(300,645)	(100,247)				(400,892)
Net income			132,893				132,893
Other comprehensive income (loss), net of tax				(143,798)			(143,798)
Balance at Dec. 31, 2014	$ 256,997	$ 3,990,160	$ 108,754	$ (404,328)	$ (293,906)		$ 3,657,677
Balance (in shares) at Dec. 31, 2014	1,027,986,000				25,517,000		1,002,469,000