Common Equity (Tables)

9 Months Ended

Sep. 30, 2014

Common Equity (Tables) [Abstract]

Shares Repurchased [Table Text Block]

	Nine Months Ended September 30
	2014			2013
	Shares	Cost		Shares	Cost
	(In Millions)
Under share repurchase programs	0.4	$	18.6	2.5	$	103.0
To fulfill exercised stock options and restricted stock awards	1.5	65.6		2.1	84.9
Total	1.9	$	84.2	4.6	$	187.9

Assumptions for valuing options using binomial option pricing model

	2014			2013
Non-qualified stock options granted year to date	899,500			1,418,560
Estimated fair value per non-qualified stock option	$	4.18		$	3.45
Assumptions used to value the options using a binomial option pricing model:
Risk-free interest rate	0.1% - 3.0%			0.1% - 1.9%
Dividend yield	3.8		%	3.7		%
Expected volatility	18.0		%	18.0		%
Expected forfeiture rate	2.0		%	2.0		%
Expected life (years)	5.8			5.9

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 July 1, 2014	8,169,393		$	28.87
Granted	—		$	—
Exercised	(597,641	)	$	23.69
Forfeited	—		$	—
Outstanding as of September 30, 2014	7,571,752		$	29.27
Outstanding as of January 1, 2014	8,089,710		$	26.84
Granted	899,500		$	41.03
Exercised	(1,400,263	)	$	22.66
Forfeited	(17,195	)	$	36.73
Outstanding as of September 30, 2014	7,571,752		$	29.27	5.6	$	103.9
Exercisable as of September 30, 2014	4,691,897		$	23.95	3.9	$	89.4

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)
$17.10 to $21.11	1,663,372	$	20.70	3.6	1,663,372	$	20.70	3.6
$23.88 to $29.35	2,778,020	$	24.82	3.7	2,778,020	$	24.82	3.7
$34.88 to $41.03	3,130,360	$	37.78	8.3	250,505	$	35.83	7.6
	7,571,752	$	29.27	5.6	4,691,897	$	23.95	3.9

Non-vested options

			Weighted-Average
Non-Vested Stock Options	Number of Options		Fair Value
Non-vested as of July 1, 2014	2,916,245		$	3.65
Granted	—		$	—
Vested	(36,390	)	$	3.62
Forfeited	—		$	—
Non-vested as of September 30, 2014	2,879,855		$	3.65
Non-vested as of January 1, 2014	2,380,790		$	3.38
Granted	899,500		$	4.18
Vested	(383,240	)	$	3.26
Forfeited	(17,195	)	$	3.56
Non-vested as of September 30, 2014	2,879,855		$	3.65

Restricted stock activity

			Weighted-Average
Restricted Shares	Number of Shares		Grant Date Fair Value
Outstanding as of July 1, 2014	156,768
Granted	—		$	—
Released	—		$	—
Forfeited	(1,289	)	$	38.61
Outstanding as of September 30, 2014	155,479
Outstanding as of January 1, 2014	150,698
Granted	71,504		$	40.96
Released	(63,509	)	$	33.02
Forfeited	(3,214	)	$	38.47
Outstanding as of September 30, 2014	155,479