Common Equity (Tables)

9 Months Ended

Sep. 30, 2012

Common Equity (Tables) [Abstract]

Shares Repurchased [Table Text Block]

	Nine Months Ended September 30
	2012			2011
	Shares	Cost		Shares	Cost
	(In Millions)
Under May 2011 share repurchase program	0.4	$	14.0	2.5	$	75.0
To fulfill exercised stock options and restricted stock awards	2.5	91.0		1.9	60.1
Total	2.9	$	105.0	4.4	$	135.1

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 July 1, 2012	9,571,531		$	23.42
Granted	—		$	—
Exercised	(370,020	)	$	17.89
Forfeited	—		$	—
Outstanding as of September 30, 2012	9,201,511		$	23.65
Outstanding as of January 1, 2012	10,638,750		$	21.65
Granted	938,770		$	34.88
Exercised	(2,368,289	)	$	19.11
Forfeited	(7,720	)	$	26.94
Outstanding as of September 30, 2012	9,201,511		$	23.65	5.4	$	129.0
Exercisable as of September 30, 2012	7,493,036		$	21.98	4.7	$	117.6

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	1,874,519	$	18.29	2.6	1,874,519	$	18.29	2.6
$21.11 to $24.92	5,940,822	$	23.13	5.5	5,491,282	$	22.99	5.4
$29.35 to $34.88	1,386,170	$	33.09	8.9	127,235	$	32.67	8.9
	9,201,511	$	23.65	5.4	7,493,036	$	21.98	4.7

Non-vested options

			Weighted-Average
Non-Vested Stock Options	Number of Options		Fair Value
Non-vested as of July 1, 2012	1,726,165		$	3.31
Granted	—		$	—
Vested	(17,690	)	$	3.31
Forfeited	—		$	—
Non-vested as of September 30, 2012	1,708,475		$	3.31
Non-vested as of January 1, 2012	3,103,770		$	3.78
Granted	938,770		$	3.34
Vested	(2,326,345	)	$	3.96
Forfeited	(7,720	)	$	3.25
Non-vested as of September 30, 2012	1,708,475		$	3.31

Restricted stock activity

			Weighted-Average
Restricted Shares	Number of Shares		Grant Date Fair Value
Outstanding as of July 1, 2012	194,697
Granted	—		$	—
Released	—		$	—
Forfeited	(1,213	)	$	31.35
Outstanding as of September 30, 2012	193,484
Outstanding as of January 1, 2012	192,558
Granted	94,959		$	34.46
Released	(88,422	)	$	30.65
Forfeited	(5,611	)	$	30.94
Outstanding as of September 30, 2012	193,484

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