Consolidated Statements of Changes in Equity and Comprehensive Income (Unaudited) (USD $) In Thousands		Total	Subsidiaries' Preferred Stock	Common Stock	Treasury Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2009		$ 8,707,360	$ 94,000	$ 2,548	$ (4,727,167)	$ 5,370,042	$ 8,043,122	$ (75,185)
Consolidated net income	[1]	539,097	10,033				529,064
Other comprehensive income:
Cash flow hedges net unrealized gain		59,071						59,071
Pension and other postretirement liabilities		5,010						5,010
Net unrealized investment gains		(19,202)						(19,202)
Foreign currency translation		(759)						(759)
Total comprehensive income		583,217
Common stock repurchases		(137,749)			(137,749)
Common stock issuances related to stock plans		20,976			13,899	7,077
Common stock dividends declared		(299,033)					(299,033)
Preferred dividend requirements of subsidiaries	[1]	(10,033)	(10,033)
Ending Balance at Jun. 30, 2010		8,864,738	94,000	2,548	(4,851,017)	5,377,119	8,273,153	(31,065)
Beginning Balance at Dec. 31, 2010		8,590,400	94,000	2,548	(5,524,811)	5,367,474	8,689,401	(38,212)
Consolidated net income	[1]	574,277	10,031				564,246
Other comprehensive income:
Cash flow hedges net unrealized gain		(71,724)						(71,724)
Pension and other postretirement liabilities		6,598						6,598
Net unrealized investment gains		27,871						27,871
Foreign currency translation		311						311
Total comprehensive income		537,333
Common stock repurchases		(159,602)			(159,602)
Common stock issuances related to stock plans		29,597			30,939	(1,342)
Common stock dividends declared		(296,131)					(296,131)
Preferred dividend requirements of subsidiaries	[1]	(10,031)	(10,031)
Ending Balance at Jun. 30, 2011		$ 8,691,566	$ 94,000	$ 2,548	$ (5,653,474)	$ 5,366,132	$ 8,957,516	$ (75,156)

[1] Consolidated net income and preferred dividend requirements of subsidiaries for both 2010 and 2011 include $6.6 million of preferred dividends on subsidiaries' preferred stock without sinking fund that is not presented as equity.