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Fair value measurements (Details 4) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Level 3 | Pension benefits |  |
Changes in Level 3 assets |  |
Balance at the beginning of the period | $ 581,000 | $ 217,000
Realized and unrealized losses | (1,000) | (24,000)
Purchases and settlements, net | 0 | 388,000
Balance at the end of the period | 580,000 | 581,000
Level 3 | Other benefits |  |
Changes in Level 3 assets |  |
Balance at the beginning of the period | 18,000 | 7,000
Realized and unrealized losses | 0 | (1,000)
Purchases and settlements, net | 0 | 12,000
Balance at the end of the period | 18,000 | 18,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 921,000,000 | 734,000,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Equity securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 672,000,000 | 513,000,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Equity index funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 127,000,000 | 95,000,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 122,000,000 | 125,000,000
Fair value measurements on a recurring basis | Level 1 | Pension benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 0 | 1,000,000
Fair value measurements on a recurring basis | Level 1 | Other benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 161,000,000 | 139,000,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Equity securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 102,000,000 | 83,000,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Equity index funds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 19,000,000 | 15,000,000
Fair value measurements on a recurring basis | Level 1 | Other benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 40,000,000 | 41,000,000
Fair value measurements on a recurring basis | Level 2 | Pension benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 311,000,000 | 289,000,000
Fair value measurements on a recurring basis | Level 2 | Pension benefits | Fixed income securities |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 228,000,000 | 213,000,000
Fair value measurements on a recurring basis | Level 2 | Pension benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 83,000,000 | 76,000,000
Fair value measurements on a recurring basis | Level 2 | Other benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 19,000,000 | 19,000,000
Fair value measurements on a recurring basis | 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 | Level 2 | Other benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 13,000,000 | 13,000,000
Fair value measurements on a recurring basis | Level 3 | Pension benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 1,000,000 | 1,000,000
Fair value measurements on a recurring basis | Level 3 | Pension benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 1,000,000 | 1,000,000
Fair value measurements on a recurring basis | Estimated fair value | Pension benefits |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Total assets | 1,233,000,000 | 1,024,000,000
Receivables and payables, net | (46,000,000) | (53,000,000)
Fair value of plan assets | 1,187,000,000 | 971,000,000
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 | 672,000,000 | 513,000,000
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 | 127,000,000 | 95,000,000
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 | 350,000,000 | 338,000,000
Fair value measurements on a recurring basis | Estimated fair value | Pension benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | 84,000,000 | 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 | 180,000,000 | 158,000,000
Receivables and payables, net | (1,000,000) | (1,000,000)
Fair value of plan assets | 179,000,000 | 157,000,000
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 | 102,000,000 | 83,000,000
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 | 19,000,000 | 15,000,000
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 | 46,000,000 | 47,000,000
Fair value measurements on a recurring basis | Estimated fair value | Other benefits | Pooled and mutual funds and other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Fair value of plan assets | $ 13,000,000 | $ 13,000,000

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity, prior to adjustments. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: 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=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to assets measured at fair value on a recurring basis using unobservable inputs (level 3). + 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(2) -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. + Details
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