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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock-based compensation expense and tax benefits | The following table reflects activity related to our stock-based compensation arrangements (in millions):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Stock-based compensation expense | $ | 58 |  |  | $ | 58 |  |  | $ | 54 |
Tax benefit recognized on stock-based compensation expense | 20 |  |  | 20 |  |  | 19 |
Tax benefit realized for tax deductions resulting from exercises and vestings | 45 |  |  | 35 |  |  | 23 |
Effect of tax deductions in excess of recognized stock-based compensation expense reported as a financing cash flow | 27 |  |  | 23 |  |  | 11 |
Summary of weighted-average assumptions used in fair value measurements | A summary of the weighted-average assumptions used in our fair value measurements is presented in the table below.
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Expected life in years | 6.0 |  |  | 6.0 |  |  | 6.0 |
Expected volatility | 49.11 | % |  | 49.30 | % |  | 48.21 | %
Expected dividend yield | 2.39 | % |  | 2.28 | % |  | 1.05 | %
Risk-free interest rate | 0.85 | % |  | 1.44 | % |  | 1.83 | %
Summary of stock option awards | A summary of the status of our stock option awards is presented in the table below.
| Number of Stock Options |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value
|  |  |  |  | (in years) |  | (in millions)
Outstanding as of January 1, 2012 | 19,906,586 |  |  | $ | 27.11 |  |  |  |  |
Granted | 262,170 |  |  | 29.23 |  |  |  |  |
Exercised | (4,738,312 | ) |  | 13.67 |  |  |  |  |
Expired | (2,196,876 | ) |  | 47.72 |  |  |  |  |
Forfeited | (18,840 | ) |  | 32.29 |  |  |  |  |
Outstanding as of December 31, 2012 | 13,214,728 |  |  | 28.54 |  |  | 3.3 |  | $ | 157 |
Exercisable as of December 31, 2012 | 12,594,488 |  |  | 28.65 |  |  | 3.0 |  | 152 |
Summary of restricted stock awards | A summary of the status of our restricted stock awards is presented in the table below.
| Number of Shares |  | Weighted- Average Grant-Date Fair Value Per Share
Nonvested shares as of January 1, 2012 | 3,249,090 |  |  | $ | 22.28 |
Granted | 1,459,317 |  |  | 28.90 |
Vested | (1,736,379 | ) |  | 23.67 |
Forfeited | (51,740 | ) |  | 22.07 |
Nonvested shares as of December 31, 2012 | 2,920,288 |  |  | 24.76 |
Summary of performance awards | A summary of the status of our performance awards considered granted is presented below.
| Nonvested Awards |  | Vested Awards
Awards outstanding as of January 1, 2012 | 691,191 |  |  | 24,635 |
Granted | 547,140 |  |  | — |
Vested | (222,250 | ) |  | 222,250 |
Forfeited | (26,667 | ) |  | (37,969 | )
Awards outstanding as of December 31, 2012 | 989,414 |  |  | 208,916 |
There were three tranches of performance awards granted during the year ended December 31, 2012 as follows:
| Awards Granted |  | Expected Conversion Rate |  | Fair Value Per Share
Third tranche of 2010 awards | 208,917 |  |  | 100% |  | $ | 28.53 |
Second tranche of 2011 awards | 233,350 |  |  | 50% |  | 28.53 |
First tranche of 2012 awards | 104,873 |  |  | 75% |  | 28.53 |
Total | 547,140 |  |  |  |  |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both performance-based awards (or share units) outstanding and performance-based awards (or share units) fully vested and expected to vest at the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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