Other Financial Data Components of Fixed Assets, Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Fixed Assets, net
Fixed assets, gross	$ 2,289		$ 2,189
Less: Accumulated depreciation	1,498		1,369
Fixed assets, net	791		820
Depreciation expense including software amortization	240		232		220
Software [Member]
Fixed Assets, net
Fixed assets, gross	997		867
Leasehold improvements [Member]
Fixed Assets, net
Fixed assets, gross	434		426
Furniture, fixtures and equipment [Member]
Fixed Assets, net
Fixed assets, gross	323		331
Computer equipment [Member]
Fixed Assets, net
Fixed assets, gross	341		332
Construction in progress [Member]
Fixed Assets, net
Fixed assets, gross	70		109
Other [Member]
Fixed Assets, net
Fixed assets, gross	$ 124	[1]	$ 124	[1]

[1] Land and buildings and Automobiles, disclosed separately in 2012, are now presented in Other to conform with the current presentation.