COMMON SHAREHOLDER EQUIT AND NCI (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Shareholders' Equity, Beginning Balance	$ 9,611,528,000
Net Income	237,836,000	229,968,000
Net Income Attributable to Noncontrolling Interests	1,879,000	1,879,000
Other Comprehensive Income (Loss), Net of Tax	1,710,000	1,956,000
Shareholders' Equity, Ending Balance	9,723,933,000
Common Shareholders Equity [Member]
Shareholders' Equity, Beginning Balance	9,611,500,000	9,237,100,000
Net Income	237,800,000	230,000,000
Dividends on Common Shares	(123,900,000)	(116,400,000)
Dividends, Preferred Stock	(1,900,000)	(1,900,000)
Issuance of Common Shares	5,200,000	8,400,000
Other Transcations, Net	(6,500,000)	(14,000,000)
Other Comprehensive Income (Loss), Net of Tax	1,700,000	2,000,000
Shareholders' Equity, Ending Balance	9,723,900,000	9,345,200,000
Preferred Stock Member
Shareholders' Equity, Beginning Balance	155,600,000	155,600,000
Dividends, Preferred Stock	(1,900,000)	(1,900,000)
Net Income Attributable to Noncontrolling Interests	1,900,000	1,900,000
Shareholders' Equity, Ending Balance	$ 155,600,000	$ 155,600,000