Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions	3 Months Ended
Mar. 31, 2011	Mar. 31, 2010
Changes in the carrying amount of goodwill [Abstract]
Balance at beginning of period	$ 48,854	$ 48,357
Changes during the period:
Business combinations	(5)	9
Dispositions	0	(19)
Other	7	12
Balance at March 31,	$ 48,856	$ 48,359

Changes in goodwill during the period Abstract.

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- Definition

The change during the reporting period in the carrying value of goodwill not categorized elsewhere within the Goodwill Roll Forward table.

+ Details

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- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

+ Details

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Balance Type:	debit
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- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e(1)

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ Details

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- Definition

Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e(3)

+ Details

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