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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Share-Based Compensation Plans [Abstract] |
Stock option activity | A summary of stock option activity is as follows:
|  |  |  |  |  |  |  | Wtd. Avg. |  |  |  |
|  |  |  |  | Wtd. Avg. |  |  | Remaining |  |  | Aggregate |
|  |  |  |  | Exercise Price |  |  | Contractual Term |  |  | Intrinsic Value |
|  | Shares (000 | ) |  | Per Share |  |  | (years) |  |  | (in millions) |
Outstanding, January 1, 2009 |  | 5,027 |  | $ | 50 |  |  |  |  |  |  |
Granted |  | 1,349 |  |  | 31 |  |  |  |  |  |  |
Exercised |  | (339 | ) |  | 33 |  |  |  |  | $ | 5 |
Expired or cancelled |  | (179 | ) |  | 53 |  |  |  |  |  |  |
Outstanding, December 31, 2009 |  | 5,858 |  | $ | 46 |  |  | 6.1 |  |  |  |
Vested or expected to vest, December 31, 2009 |  | 5,767 |  | $ | 46 |  |  | 6.1 |  |  |  |
Exercisable, December 31, 2009 |  | 3,330 |  | $ | 47 |  |  | 4.4 |  |  |  |
Outstanding, January 1, 2010 |  | 5,858 |  | $ | 46 |  |  |  |  |  |  |
Granted |  | 897 |  |  | 53 |  |  |  |  |  |  |
Exercised |  | (682 | ) |  | 37 |  |  |  |  | $ | 14 |
Expired or cancelled |  | (133 | ) |  | 50 |  |  |  |  |  |  |
Outstanding, December 31, 2010 |  | 5,940 |  | $ | 48 |  |  | 6.2 |  |  |  |
Vested or expected to vest, December 31, 2010 |  | 5,877 |  | $ | 48 |  |  | 6.1 |  |  |  |
Exercisable, December 31, 2010 |  | 3,446 |  | $ | 49 |  |  | 4.7 |  |  |  |
Outstanding, January 1, 2011 |  | 5,940 |  | $ | 48 |  |  |  |  |  |  |
Granted |  | 199 |  |  | 67 |  |  |  |  |  |  |
Exercised |  | (721 | ) |  | 39 |  |  |  |  | $ | 13 |
Expired or cancelled |  | (153 | ) |  | 49 |  |  |  |  |  |  |
Outstanding, December 31, 2011 |  | 5,265 |  | $ | 50 |  |  | 5.7 |  | $ | 7 |
Vested or expected to vest, December 31, 2011 |  | 5,235 |  | $ | 50 |  |  | 5.6 |  |  |  |
Exercisable, December 31, 2011 |  | 3,626 |  | $ | 51 |  |  | 4.8 |  | $ | 4 |
Options outstanding and exercisable | Options outstanding and exercisable as of December 31, 2011 are as follows:
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  | Weighted- |  |  |  |  |  |  |  |  |  |
|  |  |  |  | Average |  |  |  |  |  |  |  |  |  |
|  |  |  |  | Remaining |  |  | Weighted- |  |  |  |  |  | Weighted- |
|  |  |  |  | Contractual |  |  | Average |  |  |  |  |  | Average |
Exercise Price |  | Shares (000 | ) |  | Life (years) |  |  | Exercise Price |  |  | Shares (000 | ) |  | Exercise Price |
$26–$34 |  | 1,335 |  |  | 6.2 |  | $ | 31 |  |  | 724 |  | $ | 31 |
$35–$44 |  | 807 |  |  | 2.8 |  |  | 44 |  |  | 804 |  |  | 44 |
$45–$55 |  | 1,548 |  |  | 6.4 |  |  | 53 |  |  | 899 |  |  | 53 |
$56–$93 |  | 1,575 |  |  | 6.0 |  |  | 67 |  |  | 1,199 |  |  | 68 |
|  | 5,265 |  |  | 5.7 |  | $ | 50 |  |  | 3,626 |  | $ | 51 |
Assumptions used to estimate fair value of share awards | We estimated the fair value of each stock option on the date of grant using the Black-Scholes option pricing model and the following assumptions:
Year Ended December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
Average risk-free interest rate |  | 2.6% |  |  | 2.6% |  |  | 1.8% |
Expected dividend yield |  | 1.1% |  |  | 1.4% |  |  | 2.5% |
Expected volatility |  | 41.0% |  |  | 41.0% |  |  | 42.0% |
Expected term (years) |  | 5.9 |  |  | 5.4 |  |  | 5.5 |
Restricted stock activity | A summary of restricted stock activity is as follows:
|  |  |  |  |  |  |  | Wtd. Avg. |  |  |  |
|  |  |  |  |  |  |  | Remaining |  |  | Aggregate |
|  |  |  |  | Wtd. Avg. |  |  | Contractual |  |  | Intrinsic Value |
|  | Shares (000 | ) |  | Price Per Share |  |  | Term (years) |  |  | (in millions) |
Unvested, January 1, 2009 |  | 192 |  | $ | 55 |  |  | 2.7 |  |  |  |
Granted |  | 197 |  |  | 31 |  |  |  |  |  |  |
Vested |  | (15 | ) |  | 34 |  |  |  |  |  |  |
Forfeited |  | (5 | ) |  | 45 |  |  |  |  |  |  |
Unvested, December 31, 2009 |  | 369 |  | $ | 43 |  |  | 1.6 |  |  |  |
Granted |  | 21 |  | $ | 56 |  |  |  |  |  |  |
Vested |  | (86 | ) |  | 41 |  |  |  |  |  |  |
Forfeited |  | (9 | ) |  | 31 |  |  |  |  |  |  |
Unvested, December 31, 2010 |  | 295 |  | $ | 45 |  |  | 0.9 |  |  |  |
Granted |  | 264 |  | $ | 67 |  |  |  |  |  |  |
Vested |  | (143 | ) |  | 46 |  |  |  |  |  |  |
Forfeited |  | (7 | ) |  | 52 |  |  |  |  |  |  |
Unvested, December 31, 2011 |  | 409 |  | $ | 59 |  |  | 1.8 |  | $ | 15 |
Threshold, target and outstanding award levels for each outstanding grant of performance share units | The Threshold, Target and Outstanding Award levels for each outstanding grant, adjusted for forfeitures, are as follows:
|  | 2007–2009 | (a) |  | 2008–2010 | (b) |  | 2010–2011 |  |  | 2011 |
Threshold Award |  | 28,250 |  |  | 34,500 |  |  | 54,871 |  |  | 66,489 |
Target Award |  | 113,000 |  |  | 138,000 |  |  | 109,742 |  |  | 132,978 |
Outstanding Award |  | 197,750 |  |  | 241,500 |  |  | 219,484 |  |  | 265,956 |
(a) | 118,000 performance share units were granted in 2007 at the Target Award level for the 2007–2009 performance period, of which 5,000 units were forfeited.
(b) | 140,000 performance share units were granted in 2008 at the Target Award level for the 2008–2010 performance period, of which 2,000 units were forfeited.

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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