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Fair value measurements (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Significant Unobservable inputs (Level 3) | Pension benefits |  |
Changes in Level 3 assets |  |
Balance at the beginning of the period | $ 141,000 | $ 67,420,000
Realized and unrealized gains | 92,000 | 6,650,000
Purchases and settlements, net | (16,000) | (317,000)
Transfer in or out of Level 3 |  | (73,612,000)
Balance at the end of the period | 217,000 | 141,000
Significant Unobservable inputs (Level 3) | Other benefits |  |
Changes in Level 3 assets |  |
Balance at the beginning of the period | 5,000 | 13,703,000
Realized and unrealized gains | 3,000 | 1,445,000
Purchases and settlements, net | (1,000) | (3,854,000)
Transfer in or out of Level 3 |  | (11,289,000)
Balance at the end of the period | 7,000 | 5,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 606,000,000 | 597,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Equity securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 425,000,000 | 453,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Equity index funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 82,000,000 | 80,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 98,000,000 | 55,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Pension benefits | Pooled and mutual funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 1,000,000 | 9,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 125,000,000 | 135,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Equity securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 73,000,000 | 80,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Equity index funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 15,000,000 | 14,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 37,000,000 | 2,000,000
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other benefits | Pooled and mutual funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets |  | 39,000,000
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 271,000,000 | 252,000,000
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 185,000,000 | 183,000,000
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Pension benefits | Pooled and mutual funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 86,000,000 | 69,000,000
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 19,000,000 | 16,000,000
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 6,000,000 | 6,000,000
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other benefits | Pooled and mutual funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 13,000,000 | 10,000,000
Fair value measurements on a recurring basis | Estimated fair value | Pension benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 877,000,000 | 849,000,000
Receivables and payables, net | (37,000,000) | (17,000,000)
Fair value of plan assets | 840,000,000 | 832,000,000
Fair value measurements on a recurring basis | Estimated fair value | Pension benefits | Equity securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 425,000,000 | 453,000,000
Fair value measurements on a recurring basis | Estimated fair value | Pension benefits | Equity index funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 82,000,000 | 80,000,000
Fair value measurements on a recurring basis | Estimated fair value | Pension benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 283,000,000 | 238,000,000
Fair value measurements on a recurring basis | Estimated fair value | Pension benefits | Pooled and mutual funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 87,000,000 | 78,000,000
Fair value measurements on a recurring basis | Estimated fair value | Other benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 144,000,000 | 151,000,000
Receivables and payables, net | (1,000,000) |
Fair value of plan assets | 143,000,000 | 151,000,000
Fair value measurements on a recurring basis | Estimated fair value | Other benefits | Equity securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 73,000,000 | 80,000,000
Fair value measurements on a recurring basis | Estimated fair value | Other benefits | Equity index funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 15,000,000 | 14,000,000
Fair value measurements on a recurring basis | Estimated fair value | Other benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 43,000,000 | 8,000,000
Fair value measurements on a recurring basis | Estimated fair value | Other benefits | Pooled and mutual funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | $ 13,000,000 | $ 49,000,000

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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(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 FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) -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 FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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