Goodwill and Other Intangible Assets - Changes During Period (Details 2) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Changes in the carrying amount of goodwill [Abstract]
Balance at beginning of period	$ 48,856	$ 48,359	$ 48,854	$ 48,357
Changes during the period:
Business combinations	11	10	6	19
Dispositions	0	0	0	(19)
Other	15	(49)	22	(37)
Balance at March 31,	$ 48,882	$ 48,320	$ 48,882	$ 48,320

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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