Consolidated Statements of Changes in Equity and Comprehensive Income (Unaudited) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Other comprehensive income:
Other comprehensive income, derivatives qualifying as hedges, tax effect	$ (41,843,000)	$ 36,587,000
Other comprehensive income, defined benefit plans, tax	3,057,000	2,541,000
Other comprehensive income, available-for-sale securities, tax	28,726,000	(16,708,000)
Other comprehensive income, foreign currency translation adjustment, tax	167,000	(409,000)
Preferred dividends on subsidiaries' preferred stock	6,600,000	6,600,000
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income:
Other comprehensive income, derivatives qualifying as hedges, tax effect	(41,843,000)	36,587,000
Other comprehensive income, defined benefit plans, tax	3,057,000	2,541,000
Other comprehensive income, available-for-sale securities, tax	28,726,000	(16,708,000)
Other comprehensive income, foreign currency translation adjustment, tax	$ 167,000	$ (409,000)