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Postretirement Benefit Plans (Details 12) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | $ 192 | $ 195 |
Pension [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 184 | 187 | 176
Pension [Member] | Domestic [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 60 | 47 |
Pension [Member] | International [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 33 | 15 |
Pension [Member] | Emerging Markets [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 16 | 19 |
Pension [Member] | Fixed income [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 63 |  |
Pension [Member] | Cash and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 12 |  |
Pension [Member] | Private equity [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 55 |
Pension [Member] | Absolute return (hedge funds) [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 32 |
Pension [Member] | Commodities, fixed income and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 19 |
Pension [Member] | Level 1 [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 54 |
Pension [Member] | Level 1 [Member] | Domestic [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 36 |
Pension [Member] | Level 1 [Member] | International [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 10 |
Pension [Member] | Level 1 [Member] | Emerging Markets [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 8 |
Pension [Member] | Level 1 [Member] | Private equity [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 0 |
Pension [Member] | Level 1 [Member] | Absolute return (hedge funds) [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 0 |
Pension [Member] | Level 1 [Member] | Commodities, fixed income and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 0 |
Pension [Member] | Level 2 [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 184 | 51 |
Pension [Member] | Level 2 [Member] | Domestic [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 60 | 7 |
Pension [Member] | Level 2 [Member] | International [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 33 | 0 |
Pension [Member] | Level 2 [Member] | Emerging Markets [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 16 | 9 |
Pension [Member] | Level 2 [Member] | Fixed income [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 63 |  |
Pension [Member] | Level 2 [Member] | Cash and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 12 |  |
Pension [Member] | Level 2 [Member] | Private equity [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 7 |
Pension [Member] | Level 2 [Member] | Absolute return (hedge funds) [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 12 |
Pension [Member] | Level 2 [Member] | Commodities, fixed income and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 16 |
Pension [Member] | Level 3 [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 82 | 79
Pension [Member] | Level 3 [Member] | Equities [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 11 | 9
Pension [Member] | Level 3 [Member] | Domestic [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 4 |
Pension [Member] | Level 3 [Member] | International [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 5 |
Pension [Member] | Level 3 [Member] | Emerging Markets [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 2 |
Pension [Member] | Level 3 [Member] | Private equity [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 48 | 47
Pension [Member] | Level 3 [Member] | Absolute return (hedge funds) [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 20 | 21
Pension [Member] | Level 3 [Member] | Commodities, fixed income and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 3 | 2
Other Benefits [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 8 | 8 | 8
Other Benefits [Member] | Domestic [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Other Benefits [Member] | International [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Other Benefits [Member] | Emerging Markets [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Other Benefits [Member] | Fixed income [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 |  |
Other Benefits [Member] | Cash and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 8 |  |
Other Benefits [Member] | Private equity [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 0 |
Other Benefits [Member] | Absolute return (hedge funds) [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 0 |
Other Benefits [Member] | Commodities, fixed income and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 8 |
Other Benefits [Member] | Level 3 [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 8 | 8 |
Other Benefits [Member] | Level 3 [Member] | Domestic [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Other Benefits [Member] | Level 3 [Member] | International [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Other Benefits [Member] | Level 3 [Member] | Emerging Markets [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 | 0 |
Other Benefits [Member] | Level 3 [Member] | Fixed income [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 0 |  |
Other Benefits [Member] | Level 3 [Member] | Cash and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets | 8 |  |
Other Benefits [Member] | Level 3 [Member] | Private equity [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 0 |
Other Benefits [Member] | Level 3 [Member] | Absolute return (hedge funds) [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | 0 |
Other Benefits [Member] | Level 3 [Member] | Commodities, fixed income and other [Member] |  |  |
Fair value of plan assets held by our postretirement benefit plans |  |  |
Fair value of plan assets |  | $ 8 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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 132R -Paragraph 5 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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