Common Equity (Tables)

6 Months Ended

Jun. 30, 2012

Common Equity (Tables) [Abstract]

Shares Repurchased [Table Text Block]

	Six Months Ended June 30
	2012			2011
	Shares	Cost		Shares	Cost
	(In Millions)
Under May 2011 share repurchase program	—	$	—	—	$	—
To fulfill exercised stock options and restricted stock awards	2.1	75.7		1.6	50.8
Total	2.1	$	75.7	1.6	$	50.8

Assumptions for valuing options using binomial option pricing model

	2012		2011
Risk-free interest rate	0.1% - 2.0%		0.2% - 3.4%
Dividend yield	3.9	%	3.9	%
Expected volatility	19.0	%	19.0	%
Expected forfeiture rate	2.0	%	2.0	%
Expected life (years)	5.9		5.5

Stock option activity

					Weighted-
					Average
			Weighted-		Remaining	Aggregate
	Number of		Average		Contractual Life	Intrinsic Value
Stock Options	Options		Exercise Price		(Years)	(Millions)
Outstanding as of April 1, 2012	10,851,131		$	23.03
Granted	—		$	—
Exercised	(1,279,600	)	$	20.09
Forfeited	—		$	—
Outstanding as of June 30, 2012	9,571,531		$	23.42
Outstanding as of January 1, 2012	10,638,750		$	21.65
Granted	938,770		$	34.88
Exercised	(1,998,269	)	$	19.34
Forfeited	(7,720	)	$	26.94
Outstanding as of June 30, 2012	9,571,531		$	23.42	5.6	$	154.5
Exercisable as of June 30, 2012	7,845,366		$	21.76	4.9	$	139.7

Stock options outstanding

	Options Outstanding				Options Exercisable
		Weighted-Average				Weighted-Average
				Remaining				Remaining
	Number of	Exercise		Contractual	Number of	Exercise		Contractual
Range of Exercise Prices	Options	Price		Life (Years)	Options	Price		Life (Years)
$12.71 to $19.74	2,188,544	$	18.08	2.7	2,188,544	$	18.08	2.7
$21.11 to $24.92	5,995,997	$	23.14	5.8	5,541,467	$	22.99	5.6
$29.35 to $34.88	1,386,990	$	33.09	9.2	115,355	$	32.60	9.1
	9,571,531	$	23.42	5.6	7,845,366	$	21.76	4.9

Non-vested options

			Weighted-Average
Non-Vested Stock Options	Number of Options		Fair Value
Non-vested as of April 1, 2012	1,732,770		$	3.31
Granted	—		$	—
Vested	(6,605	)	$	3.30
Forfeited	—		$	—
Non-vested as of June 30, 2012	1,726,165		$	3.31
Non-vested as of January 1, 2012	3,103,770		$	3.78
Granted	938,770		$	3.34
Vested	(2,308,655	)	$	3.96
Forfeited	(7,720	)	$	3.25
Non-vested as of June 30, 2012	1,726,165		$	3.31

Restricted stock activity

			Weighted-Average
Restricted Shares	Number of Shares		Grant Date Fair Value
Outstanding as of April 1, 2012	210,912
Granted	—		$	—
Released	(15,762	)	$	19.38
Forfeited	(453	)	$	31.02
Outstanding as of June 30, 2012	194,697
Outstanding as of January 1, 2012	192,558
Granted	94,959		$	34.46
Released	(88,422	)	$	30.65
Forfeited	(4,398	)	$	30.83
Outstanding as of June 30, 2012	194,697

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]