Restructuring Costs (Restructuring Activities) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Restructuring Reserve [Roll Forward]
Liability at beginning of period	$ 181	$ 211
Amount Accrued	11	51
Cash Paid	(49)	(82)
Other	2	1
Liability at end of period	145	181
Severance [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	27	40
Amount Accrued	8	29
Cash Paid	(28)	(40)
Other	4	(2)
Liability at end of period	11	27
Future Rent Under Non-Cancelable Leases and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	154	171
Amount Accrued	3	22
Cash Paid	(21)	(42)
Other	(2)	3
Liability at end of period	$ 134	$ 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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