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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Common Stock, Shares, Outstanding beginning of period | 75,362,956 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,666 |
Net Income (Loss) Attributable to Parent | 49 | 69
Common Stock, Shares, Outstanding end of period | 75,504,580 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,695 |
Common Stock [Member] |  |
Common Stock, Shares, Outstanding beginning of period | 75,362,956 | 75,316,419
Vesting of Restricted and Performance Stock Units, Shares | 140,714 | 9,184
Shares Issued During Period, Dividend Reinvestment and Direct Stock Purchase Plan | 910 |
Common Stock, Shares, Outstanding end of period | 75,504,580 | 75,325,603
Common Stock Including Additional Paid in Capital [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 836 | 831
Vesting of Restricted and Performance Stock Units, Value | 0 | 0
Stock Issued During Peirod, Value, Dividend Reinvestment and Direct Stock Purchase Plan | 0 |
Stock-based Compensation | 0 | 1
Dividends, Common Stock | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 0 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 836 | 832
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6) | (5)
Vesting of Restricted and Performance Stock Units, Value | 0 | 0
Stock-based Compensation | 0 | 0
Dividends, Common Stock | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 0 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (6) | (5)
Retained Earnings [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 833 | 766
Vesting of Restricted and Performance Stock Units, Value | 0 | 0
Stock-based Compensation | 0 | 0
Dividends, Common Stock | (20) | (20)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 0 |
Net Income (Loss) Attributable to Parent | 49 | 69
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 862 | 815
Noncontrolling Interest [Member] |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 3 | 7
Vesting of Restricted and Performance Stock Units, Value | 0 | 0
Stock-based Compensation | 0 | 0
Dividends, Common Stock | 0 | 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | 0 | (4)
Net Income (Loss) Attributable to Noncontrolling Interest | 0 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 3 | $ 3

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- Definition Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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