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Long-Term Incentive Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Mar. 31, 2010 | Mar. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2011 Omnibus Plan [Member] | Dec. 31, 2011 Restricted Share Activity [Member] | Dec. 31, 2010 Restricted Share Activity [Member] | Dec. 31, 2009 Restricted Share Activity [Member] | Dec. 31, 2011 Restricted Share Units [Member] | Dec. 31, 2011 Stock Options [Member] years | Dec. 31, 2010 Stock Options [Member] | Dec. 31, 2009 Stock Options [Member] | Dec. 31, 2011 Performance Based Awards [Member] | Dec. 31, 2010 Performance Based Awards [Member] | Dec. 31, 2011 Deferred Cash Awards [Member] | Dec. 31, 2010 Deferred Cash Awards [Member] | Dec. 31, 2009 Deferred Cash Awards [Member] | Dec. 31, 2011 Maximum [Member] | Dec. 31, 2011 Maximum [Member] Performance Based Awards [Member] | Dec. 31, 2011 Minimum [Member] | Feb. 28, 2009 Chief Executive Officer [Member] | Dec. 31, 2009 Chief Executive Officer [Member] | Dec. 31, 2011 Board Of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares of common stock reserved and available for issuance |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder approved increase in common stock reserved and available for issuance |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under omnibus plan in connection with stock options, count |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under omnibus plan in connection with other than stock options, count |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ISO and NQSO granted price at fair value of common stock, percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 4 |  |  |
Options expire in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  | 7 |  |  |
Options granted | 1,100,000 | 1,900,000 |  | 1,100,000 | 1,900,000 |  | 0 |  |  |  |  | 0 |  |  | 31,000 |  |  |  |  |  |  |  | 1 | 1,291,990 |
Options expired or canceled |  |  | 225,874 | 1,493,873 | 1,167,374 |  | 225,874 |  |  |  |  |  |  |  | 15,136 |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  |  | 235,050 | 805,776 | 2,194,686 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Canceled |  |  |  |  |  |  |  | 58,466 | 913,070 | 567,615 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Options |  |  | 6,425,073 | 6,650,947 | 7,044,820 | 6,312,194 |  |  |  |  |  |  |  |  | 244,180 |  |  |  |  |  |  |  |  |  |
Shares/units available for future grants |  |  |  |  |  |  |  | 6,533,715 |  |  |  |  |  |  | 105,820 |  |  |  |  |  | 350,000 |  |  |  |
Fair value of restricted shares awarded |  |  | $ 2 | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of restricted shares cancelled |  |  | 1 | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unearned compensation, net of estimated forfeitures |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unearned compensation, net of estimated forfeitures, expected to be recognized, years |  |  | 2.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unearned compensation amortized over vesting period, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 3 |  |  | 10
Compensation expense related to restricted shares, net of estimated forfeitures |  |  |  |  |  |  |  | 9 | 6 | 9 |  | 4 | 2 | 6 | 2 | 5 | 9 | 7 | 5 |  |  |  |  |  |
Tax benefit related to restricted share awards |  |  |  |  |  |  |  | 2 | 2 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax charge related to restricted share awards |  |  |  |  |  |  |  | 1 | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option awards exercised |  |  | 2,211,878 | 2,050,252 | 2,006,620 |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset write off |  |  |  |  |  |  |  |  |  |  |  | 3 | 2 |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Expected to be recognized as expense over a weighted average period, years |  |  |  |  |  |  |  |  |  |  |  | 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |
Grants restriction period, years |  |  | four |  |  |  |  |  |  |  |  |  |  |  | five |  |  |  |  |  |  |  |  |  |
Long-term incentive awards vesting period, years, minimum |  |  | three |  |  |  |  |  |  |  |  |  |  |  |  |  | three |  |  |  |  |  |  |  |
Long-term incentive awards vesting period, years, maximum |  |  | five |  |  |  |  |  |  |  |  |  |  |  |  |  | five |  |  |  |  |  |  |  |

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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + 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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(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 4: 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant