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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Activity in allowance for doubtful trade accounts receivable
The activity in the allowance for doubtful accounts receivable for the years ended December 31 is as follows:
 
In millions
2015
 
2014
 
2013
Beginning balance
$
256

 
$
256

 
$
243

Additions charged to bad debt expense
216

 
185

 
195

Write-offs charged to allowance
(311
)
 
(185
)
 
(182
)
Ending balance
$
161

 
$
256

 
$
256
Components of property and equipment
The following are the components of property and equipment at December 31: 
In millions
2015
 
2014
Land
$
1,635

 
$
1,506

Building and improvements
3,168

 
2,828

Fixtures and equipment
10,001

 
8,958

Leasehold improvements
4,015

 
3,626

Software
2,217

 
1,868

 
21,036

 
18,786

Accumulated depreciation and amortization
(11,181
)
 
(9,943
)
Property and equipment, net
$
9,855

 
$
8,843
Reconciliation of the changes in the redeemable noncontrolling interest
Below is a summary of the changes in redeemable noncontrolling interest for the year ended December 31, 2015:
In millions
 
Acquisition of noncontrolling interest
$
39

Net income attributable to noncontrolling interest
1

Distributions
(1
)
Balance, December 31, 2015
$
39
Schedule of Accumulated Other Comprehensive Income (Loss) by Component
Changes in accumulated other comprehensive income (loss) by component are shown below:
 
Year Ended December 31, 2015(1)
In millions
Foreign Currency
 
Losses on Cash Flow Hedges
 
Pension and Other Postretirement Benefits
 
Total
Balance, December 31, 2014
$
(65
)
 
$
(9
)
 
$
(143
)
 
$
(217
)
     Other comprehensive income (loss) before
       reclassifications
(100
)
 
—

 
(56
)
 
(156
)
     Amounts reclassified from accumulated
       other comprehensive income (2)
—

 
2

 
13

 
15

Net other comprehensive income (loss)
(100
)
 
2

 
(43
)
 
(141
)
Balance, December 31, 2015
$
(165
)
 
$
(7
)
 
$
(186
)
 
$
(358
)
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2014(1)
 
Foreign Currency
 
Losses on Cash Flow Hedges
 
Pension and Other Postretirement Benefits
 
Total
Balance, December 31, 2013
$
(30
)
 
$
(13
)
 
$
(106
)
 
$
(149
)
     Other comprehensive income (loss) before
       reclassifications
(35
)
 
—

 
—

 
(35
)
     Amounts reclassified from accumulated
       other comprehensive income (2)
—

 
4

 
(37
)
 
(33
)
Net other comprehensive income (loss)
(35
)
 
4

 
(37
)
 
(68
)
Balance, December 31, 2014
$
(65
)
 
$
(9
)
 
$
(143
)
 
$
(217
)

(1)
All amounts are net of tax.
(2)
The amounts reclassified from accumulated other comprehensive income for cash flow hedges are recorded within interest expense, net on the consolidated statement of income. The amounts reclassified from accumulated other comprehensive income for pension and other postretirement benefits are included in operating expenses on the consolidated statement of income.
Discontinued Operations Results
Below is a summary of the results of discontinued operations for the years ended December 31:

In millions
 
2015
 
2014
 
2013
Income from discontinued operations
 
$
15

 
$
(1
)
 
$
(12
)
Income tax expense
 
(6
)
 
—

 
4

Income from discontinued operations, net of tax
 
$
9

 
$
(1
)
 
$
(8
)
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
The following is a reconciliation of the effect of this reclassification on the Company’s consolidated balance sheet as of December 31, 2014:
In millions
 
As Previously Reported
 
Adjustments
 
As Revised
Other assets
 
$
1,510

 
$
(65
)
 
$
1,445

Total assets
 
74,252

 
(65
)
 
74,187

Long-term debt
 
11,695

 
(65
)
 
11,630

Total liabilities and shareholders’ equity
 
74,252

 
(65
)
 
74,187