Retirement Plans (Details 4) (USD $) In Millions	Sep. 30, 2011
Pension Plans, Defined Benefit [Member]
Accumulated other comprehensive loss (income)
Net transition obligation	$ 2
Net actuarial loss	1,663
Net prior service credit	(11)
Total	1,654
Postretirement Health and Other Benefits [Member]
Accumulated other comprehensive loss (income)
Net actuarial loss	16
Net prior service credit	(35)
Total	$ (19)

Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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-Name Accounting Standards Codification

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+ Details

- Definition

Of the original amount of transition assets as of the date FAS 87 or 106 was initially applied, (a) the fair value of plan assets plus any recognized accrued pension or other postretirement benefit cost or less any recognized prepaid pension or other postretirement benefit cost in excess of (b) the benefit obligation, the portion of which has yet to be recognized as components of net periodic benefit cost. Of the original amount of transition obligations as of the date FAS 87 or 106 was initially applied, (a) the benefit obligation in excess of (b) the fair value of plan assets plus any recognized accrued pension or other postretirement benefit cost or less any recognized prepaid pension or other postretirement benefit cost, the portion of which has yet to be recognized as components of net periodic benefit cost. This amount is pretax.

+ References

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

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-Name Statement of Financial Accounting Standard (FAS)

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Transition Obligation

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+ Details