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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

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+ 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)

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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

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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-Paragraph 32

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