Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Balances in the Allowance Accounts

The balances in the allowance accounts at December 31, 2013 and 2012 were as follows (table in millions):

	December 31,
	2013		2012
Current	$	62	$	68
Non-current (included in other assets, net)	3		4
	$	65	$	72

Estimated Useful Lives of the Assets

Depreciation commences upon placing the asset in service and is recognized on a straight-line basis over the estimated useful lives of the assets, as follows:

Furniture and fixtures	5-10 years
Equipment and software	2-10 years
Improvements	5-31 years
Buildings	15-51 years

Property, plant and equipment consist of (table in millions):

	December 31, 2013			December 31, 2012
Furniture and fixtures	$	229		$	197
Equipment and software	5,973			5,345
Buildings and improvements	2,089			1,873
Land	132			121
Building construction in progress	215			197
	8,638			7,733
Accumulated depreciation	(5,160		)	(4,588		)
	$	3,478		$	3,145