Postretirement Benefits (Details) (U.S. Pension Benefits, USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2010	Sep. 30, 2010	Aug. 31, 2010
U.S. Pension Benefits
Amendments to Pension and Other Postretirement Benefit Plans
Increase (decrease) in postretirement benefit liability due to plan remeasurement			$ 1,320,000,000
Increase (decrease) in accumulated other comprehensive income			(831,000,000)
Curtailment losses due to pension plan amendment	$ 28,000,000	$ 28,000,000

The amount of increase or decrease in the accumulated benefit obligation related to the effects of a change in the substantive terms of an existing defined benefit pension plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph r

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant