Common Equity (Tables)

6 Months Ended

Jun. 30, 2014

Common Equity (Tables) [Abstract]

Shares Repurchased [Table Text Block]

	Six Months Ended June 30
	2014			2013
	Shares	Cost		Shares	Cost
	(In Millions)
Under share repurchase programs	0.4	$	18.6	1.3	$	54.7
To fulfill exercised stock options and restricted stock awards	0.9	38.7		2.0	81.0
Total	1.3	$	57.3	3.3	$	135.7

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 April 1, 2014	8,276,994		$	28.82
Granted	—		$	—
Exercised	(96,791	)	$	24.07
Forfeited	(10,810	)	$	37.94
Outstanding as of June 30, 2014	8,169,393		$	28.87
Outstanding as of January 1, 2014	8,089,710		$	26.84
Granted	899,500		$	41.03
Exercised	(802,622	)	$	21.89
Forfeited	(17,195	)	$	36.73
Outstanding as of June 30, 2014	8,169,393		$	28.87	5.6	$	147.5
Exercisable as of June 30, 2014	5,253,148		$	23.82	3.9	$	121.3

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	1,682,973	$	20.67	3.8	1,682,973	$	20.67	3.8
$23.88 to $29.35	3,356,060	$	24.66	3.7	3,356,060	$	24.66	3.7
$34.88 to $41.03	3,130,360	$	37.78	8.5	214,115	$	35.50	7.7
	8,169,393	$	28.87	5.6	5,253,148	$	23.82	3.9

Non-vested options

			Weighted-Average
Non-Vested Stock Options	Number of Options		Fair Value
Non-vested as of April 1, 2014	2,939,015		$	3.65
Granted	—		$	—
Vested	(11,960	)	$	3.65
Forfeited	(10,810	)	$	3.65
Non-vested as of June 30, 2014	2,916,245		$	3.65
Non-vested as of January 1, 2014	2,380,790		$	3.38
Granted	899,500		$	4.18
Vested	(346,850	)	$	3.22
Forfeited	(17,195	)	$	3.56
Non-vested as of June 30, 2014	2,916,245		$	3.65

Restricted stock activity

			Weighted-Average
Restricted Shares	Number of Shares		Grant Date Fair Value
Outstanding as of April 1, 2014	157,595
Granted	—		$	—
Released	—		$	—
Forfeited	(827	)	$	38.83
Outstanding as of June 30, 2014	156,768
Outstanding as of January 1, 2014	150,698
Granted	71,504		$	40.96
Released	(63,509	)	$	33.02
Forfeited	(1,925	)	$	38.38
Outstanding as of June 30, 2014	156,768