v2.4.0.6

Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended | 19 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Common Shares Y | Dec. 31, 2010 Common Shares | Jun. 30, 2010 Common Shares | Dec. 31, 2011 Common Shares | Dec. 31, 2011 Common Shares | Nov. 30, 2010 Mandatory convertible preference shares | Dec. 31, 2010 Mandatory convertible preference shares | Dec. 31, 2009 Mandatory convertible preference shares | Dec. 31, 2011 Convertible perpetual preference shares D | Dec. 31, 2010 Convertible perpetual preference shares
Equity Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of entity issued and outstanding common shares approved by the Board of Directors |  |  |  |  |  | $ 700 |  |  |  |  |  |  |
Extension period of share repurchase program (in years) |  |  |  | 1 |  |  |  |  |  |  |  |  |
Repurchase of common shares | 1,933,286 | 6,714,573 |  |  | 6,714,573 |  | 1,933,286 | 8,647,859 |  |  |  |  |
Repurchase of common shares | 120 | 354 |  |  | 354 |  | 120 | 474 |  |  |  |  |
Issuance of common shares: |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of additional shares for conversion |  |  |  |  | 1,702,642 |  |  |  |  |  |  |  |
Conversion of mandatory convertible preference shares |  |  |  |  | 8,417,215 |  |  |  |  |  |  |  |
Preference shares outstanding |  |  |  |  |  |  |  |  | 862,455 |  | 862,455 | 6,900,000 | 6,900,000
Convertible preference share, number of common shares issued upon conversion |  |  |  |  |  |  |  |  |  | 9.7596 |  |  |
Preference shares, par value (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01
Preference shares, liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  | $ 1,000 |  |  | $ 100 | $ 100
Convertible preference share, common shares issued upon conversion, at any time before mandatory conversion date |  |  |  |  |  |  |  |  | 8.2416 |  |  | 1.0991 |
Convertible preference shares accrued dividends (as a percent) |  |  |  |  |  |  |  |  |  | 5.125% |  | 4.875% |
Dividends paid in cash | $ 34 | $ 67 | $ 78 |  |  |  |  |  | $ 44 |  |  | $ 34 | $ 34
Accumulated unpaid dividends up to a maximum additional (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25 |
Conversion price, convertible preference share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 90.9802 |
Convertible preference shares, aggregate common shares issued if converted at current conversion rate |  |  |  |  |  |  |  |  | 7,108,009 |  |  | 7,583,790 |
Target ratio of closing share price to conversion price as a condition for conversion or redemption of Convertible Notes (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 130.00% |
Minimum number of trading days triggering conversion or redemption feature |  |  |  |  |  |  |  |  |  |  |  | 20 |
The maximum period of consecutive trading days that the entity's common stock closing price to conversion price must exceed a specified percentage of conversion price to trigger conversion or redemption feature of notes |  |  |  |  |  |  |  |  |  |  |  | 30 |

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