Stock-Based Compensation (Tables)

3 Months Ended

12 Months Ended

Dec. 31, 2011

Dec. 31, 2012

Share-based Compensation [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

Stock-based compensation for the reporting periods is as follows:

	2012		2011		2010
	(In millions)
Stock-based compensation expense	$	83	$	66	$	52
Tax benefit	33		25		20
Stock-based compensation cost capitalized in property, plant and equipment	5		4		3

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Stock option activity was as follows:

	Number of Options		Weighted Average Exercise Price		Aggregate Intrinsic Value (In millions)
Options outstanding at January 1, 2012	2,764,670		$	41.25
Granted	—		$	—
Exercised	(1,555,227	)	$	40.78
Forfeited or expired	(16,773	)	$	42.02
Options outstanding at December 31, 2012	1,192,670		$	41.86	$	22
Options exercisable at December 31, 2012	991,826		$	41.44	$	19

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The number, weighted average exercise price and weighted average remaining contractual life of options outstanding were as follows:

						Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)
					Number of Options
Range of Exercise Prices
$	27.00	—	$	38.00	142,619	$	27.98	6.15
$	38.01	—	$	42.00	291,982	$	41.14	3.22
$	42.01	—	$	45.00	605,569	$	44.03	5.40
$	45.01	—	$	50.00	152,500	$	47.62	4.03
					1,192,670	$	41.86	4.78

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2010
Risk-free interest rate	2.91	%
Dividend yield	5.08	%
Expected volatility	22.96	%
Expected life	6 years

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

Stock award activity for the periods ended December 31 was:

	2012		2011		2010
Fair value of awards vested (in millions)	$	9	$	13	$	19
Restricted common shares awarded	167,320		381,840		238,405
Weighted average market price of shares awarded	$	53.71	$	47.98	$	44.08
Compensation cost charged against income (in millions)	$	12	$	12	$	12

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table summarizes the Company’s stock awards activity for the period ended December 31, 2012:

	Restricted Stock		Weighted Average Grant Date Fair Value
Balance at January 1, 2012	726,224		$	42.25
Grants	167,320		$	53.71
Forfeitures	(37,767	)	$	48.46
Vested and issued	(258,129	)	$	34.41
Balance at December 31, 2012	597,648		$	48.33

Share Based Compensation Expense [Table Text Block]

The Company recorded compensation expense as follows:

	2012		2011		2010
	(In millions)
Compensation expense	$	71	$	53	$	36
Cash settlements (a)	$	4	$	3	$	3
Stock settlements (a)	$	41	$	25	$	23

Summary of Performance Share Activity [Table Text Block]

The following table summarizes the Company’s performance share activity for the period ended December 31, 2012:

	Performance Shares
Balance at January 1, 2012	1,608,733
Grants	590,098
Forfeitures	(59,712	)
Payouts	(504,755	)
Balance at December 31, 2012	1,634,364

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]

	Unrecognized Compensation Cost		Weighted Average to be Recognized
	(In millions)		(In years)
Options	$	—	0.15
Stock awards	11		1.02
Performance shares	47		1.46
	$	58	1.37