Restructuring Costs (Restructuring Activities) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]
Liability at beginning of period	$ 170	$ 181
Amount Accrued	13	78
Cash Paid	(47)	(88)
Other	(1)	(1)
Liability at end of period	135	170
Severance [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	36	27
Amount Accrued	7	46
Cash Paid	(26)	(38)
Other	(2)	1
Liability at end of period	15	36
Future Rent Under Non-Cancelable Leases and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	134	154
Amount Accrued	6	32
Cash Paid	(21)	(50)
Other	1	(2)
Liability at end of period	$ 120	$ 134

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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