Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

Pre-tax compensation expense and related income tax benefit for stock-based incentives

	Three Months Ended March  31,
	2012		2011
Long-term stock awards	$	8	$	10
Stock options		5		5
Phantom stock awards and stock appreciation rights		5		3
Total	$	18	$	18
Income tax benefit (before valuation allowance)	$	7	$	7

Company's long-term stock award activity

	Three Months Ended March  31,
	2012		2011
Unvested stock award shares at January 1		10		10
Weighted average grant date fair value	$	17	$	19
Stock award shares granted		1		2
Weighted average grant date fair value	$	12	$	13
Stock award shares vested		2		1
Weighted average grant date fair value	$	17	$	19
Stock award shares forfeited		—		—
Weighted average grant date fair value	$	18	$	18
Unvested stock award shares at March 31		9		11
Weighted average grant date fair value	$	16	$	17

Company's stock option activity

	Three Months Ended March  31,
	2012		2011
Option shares outstanding, January 1		36		37
Weighted average exercise price	$	21	$	21
Option shares granted		1		2
Weighted average exercise price	$	12	$	13
Option shares exercised		—		—
Aggregate intrinsic value on date of exercise (A)	$	1 million	$	1 million
Weighted average exercise price	$	8	$	8
Option shares forfeited		2		—
Weighted average exercise price	$	18	$	23
Option shares outstanding, March 31		35		39
Weighted average exercise price	$	21	$	21
Weighted average remaining option term (in years)		5		6
Option shares vested and expected to vest, March 31		35		39
Weighted average exercise price	$	21	$	21
Aggregate intrinsic value (A)	$	26 million	$	33 million
Weighted average remaining option term (in years)		5		6
Option shares exercisable (vested), March 31		25		24
Weighted average exercise price	$	23	$	24
Aggregate intrinsic value (A)	$	14 million	$	11 million
Weighted average remaining option term (in years)		4		4

(A) Aggregate intrinsic value is calculated using the Company’s stock price at each respective date, less the exercise price (grant date price) multiplied by the number of shares.

Weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model

	Three Months Ended March 31,
	2012			2011
Weighted average grant date fair value	$	4.44		$	5.10
Risk-free interest rate		1.10	%		2.72	%
Dividend yield		2.57	%		2.34	%
Volatility factor		51.00	%		49.00	%
Expected option life		6 years			6 years