Restructuring Costs (Restructuring Activities) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Restructuring Reserve [Roll Forward]
Liability at beginning of period	$ 181	$ 211
Amount Accrued	21	51
Cash Paid	(66)	(82)
Other	7	1
Liability at end of period	143	181
Severance [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	27	40
Amount Accrued	12	29
Cash Paid	(35)	(40)
Other	6	(2)
Liability at end of period	10	27
Future Rent Under Non-Cancelable Leases and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	154	171
Amount Accrued	9	22
Cash Paid	(31)	(42)
Other	1	3
Liability at end of period	$ 133	$ 154

The charge against earnings in the period, comprised of costs associated with restructuring activities not otherwise specified in the taxonomy pursuant to a duly authorized plan, excluding a discontinued operation as defined by generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, but excludes costs associated with the retirement of a long-lived asset and severance costs associated with established compensation plans.

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Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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