Retirement Plans (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Additional Retirement Plans (Textual)
Age of qualified retirees minimum	55
Age of qualified retirees maximum	65
Value of assets under supplemental plan	$ 7	$ 21
After tax reduction to equity recorded in accumulated other comprehensive income (loss)	631	385
Estimated pension and postretirement medical expense for 2012	145
Estimated amortization of unrecognized net actuarial losses for 2012	85
Current target allocations for plan assets to equity securities	50.00%
Current target allocations for plan assets to fixed income securities	25.00%
Current target allocations for plan assets to others	25.00%
Net asset value per fund share related to short term investment funds	$ 1
Budgeted contributions to funded pension plans in 2012	150
Expense related to contribution for several defined contribution plans	28	24	24
Funded Pension Plans [Member]
Retirement Plans (Textual) [Abstract]
Accumulated benefit obligation for the defined benefit pension plan	1,703	1,355
Unfunded Pension Plan [Member]
Retirement Plans (Textual) [Abstract]
Accumulated benefit obligation for the defined benefit pension plan	$ 202	$ 176

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After-tax reduction to equity recorded in Accumulated other comprehensive income (loss).

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Age of qualified retirees maximum.

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Age of qualified retirees minimum.

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- Definition

The Corporation's budgeted contributions to its funded pension plans in next fiscal year.

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No definition available.

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Estimated amortization of unrecognized net actuarial losses for next fiscal year.

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No definition available.

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Estimated pension and postretirement medical expense for next fiscal year.

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No definition available.

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Net asset value per fund share related to short term investment funds.

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Value of assets under supplemental plan.

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No definition available.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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-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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-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

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- Definition

Target allocation percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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No definition available.

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Target allocation percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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No definition available.

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The amount of the cost recognized during the period for defined contribution plans.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-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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-Publisher FASB

-Name Accounting Standards Codification

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