Pensions and Other Postretirement Benefits (Details Textual) (USD $) In Millions	9 Months Ended
Sep. 30, 2011	Dec. 31, 2011
Pension Plans [Member]
Pension and Other Postretirement Benefit (Textuals)
Expected contributions to plans		$ 176
Employer contributions	148
Postretirement Benefit Plans [Member]
Pension and Other Postretirement Benefit (Textuals)
Expected contributions to plans		13
Employer contributions	$ 8

The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph g

Name:	us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant