Common Equity (Tables)

3 Months Ended

Mar. 31, 2014

Common Equity (Tables) [Abstract]

Shares Repurchased [Table Text Block]

	Three Months Ended March 31
	2014			2013
	Shares	Cost		Shares	Cost
	(In Millions)
Under share repurchase programs	0.4	$	18.6	0.3	$	11.1
To fulfill exercised stock options and restricted stock awards	0.8	34.0		1.4	55.4
Total	1.2	$	52.6	1.7	$	66.5

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 January 1, 2014	8,089,710		$	26.84
Granted	899,500		$	41.03
Exercised	(705,831	)	$	30.47
Forfeited	(6,385	)	$	36.55
Outstanding as of March 31, 2014	8,276,994		$	28.82	5.8	$	146.7
Exercisable as of March 31, 2014	5,337,979		$	23.80	4.1	$	121.5

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	1,724,864	$	20.65	4.0	1,724,864	$	20.65	4.0
$23.88 to $29.35	3,404,195	$	24.68	4.0	3,404,195	$	24.68	4.0
$34.87 to $41.03	3,147,935	$	37.78	8.8	208,920	$	35.39	7.9
	8,276,994	$	28.82	5.8	5,337,979	$	23.80	4.1

Non-vested options

			Weighted-Average
Non-Vested Stock Options	Number of Options		Fair Value
Non-vested as of January 1, 2014	2,380,790		$	3.38
Granted	899,500		$	4.18
Vested	(334,890	)	$	3.20
Forfeited	(6,385	)	$	3.41
Non-vested as of March 31, 2014	2,939,015		$	3.65

Restricted stock activity

			Weighted-Average
Restricted Shares	Number of Shares		Grant Date Fair Value
Outstanding as of January 1, 2014	150,698
Granted	71,504		$	40.96
Released	(63,509	)	$	33.02
Forfeited	(1,098	)	$	38.04
Outstanding as of March 31, 2014	157,595