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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2011
Significant Accounting Policies  
Activity in allowance for doubtful trade accounts receivable

 

 

 

 

Year Ended
December 31,

 

In millions

 

2011

 

2010

 

2009

 

Beginning balance

 

$

182

 

$

224

 

$

189

 

Additions charged to bad debt expense

 

129

 

73

 

135

 

Write-offs charged to allowance

 

(122

)

(115

)

(100

)

 

 

 

 

 

 

 

 

Ending balance

 

$

189

 

$

182

 

$

224

 

 

Components of property and equipment

 

 

In millions

 

2011

 

2010

 

Land

 

$

1,295

 

$

1,247

 

Building and improvements

 

2,404

 

2,265

 

Fixtures and equipment

 

7,582

 

7,148

 

Leasehold improvements

 

3,021

 

2,866

 

Software

 

1,098

 

757

 

 

 

 

 

 

 

 

 

15,400

 

14,283

 

Accumulated depreciation and amortization

 

(6,933

)

(5,961

)

 

 

 

 

 

 

 

 

$

8,467

 

$

8,322

 

Reconciliation of the changes in the redeemable noncontrolling interest

 

 

In millions

 

2011

 

2010

 

2009

 

Beginning balance

 

$

34

 

$

37

 

$

 

Acquisition of Generation Health

 

 

 

37

 

Net loss attributable to noncontrolling interest

 

(4

)

(3

)

 

 

 

 

 

 

 

 

 

Ending balance

 

$

30

 

$

34

 

$

37