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Additional Financial Information (Tables)
 12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Income Statement Information
The following tables provide additional financial information related to our consolidated financial statements:

Income Statement Information
 
(dollars in millions)
 
Years Ended December 31,
2019

 
2018

 
2017

Depreciation expense
$
14,371

 
$
15,186

 
$
14,741

Interest costs on debt balances
5,221

 
5,399

 
5,256

Net amortization of debt discount
165

 
174

 
155

Capitalized interest costs
(656
)
 
(740
)
 
(678
)
Advertising expense
3,071

 
2,682

 
2,643

 
 
 
 
 
 
Other income (expense), net
 
 
 
 
 
Interest income
$
121

 
$
94

 
$
82

Other components of net periodic benefit (cost) income
627

 
3,068

 
(11
)
Early debt extinguishment costs
(3,604
)
 
(725
)
 
(1,983
)
Other, net
(44
)
 
(73
)
 
(109
)
 
$
(2,900
)
 
$
2,364

 
$
(2,021
)
Balance Sheet Information
Balance Sheet Information
 
(dollars in millions)
 
At December 31,
2019

 
2018

Prepaid expenses and other
 
 
 
Prepaid taxes
$
2,438

 
$
348

Deferred contract costs
2,578

 
2,083

Restricted cash
1,221

 
1,047

Other prepaid expense and other
1,791

 
1,975

 
$
8,028

 
$
5,453

 
 
 
 
Accounts payable and accrued liabilities
 
 
 
Accounts payable
$
7,725

 
$
7,232

Accrued expenses
5,984

 
5,948

Accrued vacation, salaries and wages
4,885

 
6,268

Interest payable
1,441

 
1,570

Taxes payable
1,771

 
1,483

 
$
21,806

 
$
22,501

 
 
 
 
Other current liabilities
 
 
 
Dividends payable
$
2,566

 
$
2,512

Contract liability
4,651

 
4,207

Other
1,807

 
1,520

 
$
9,024

 
$
8,239
Cash Flow Information
Cash Flow Information
 
(dollars in millions)
 
Years Ended December 31,
2019

 
2018

 
2017

Cash Paid
 
 
 
 
 
Interest, net of amounts capitalized
$
4,714

 
$
4,408

 
$
4,369

Income taxes, net of amounts refunded
3,583

 
2,213

 
4,432

 
 
 
 
 
 
Other, net Cash Flows from Operating Activities
 
 
 
 
 
Changes in device payment plan agreement non-current receivables
$
23

 
$
(509
)
 
$
(579
)
Early debt extinguishment costs
3,604

 
725

 
1,983

Other, net
(228
)
 
3

 
(728
)
 
$
3,399

 
$
219

 
$
676

 
 
 
 
 
 
Other, net Cash Flows from Financing Activities
 
 
 
 
 
Net debt related costs
$
(1,797
)
 
$
(141
)
 
$
(3,599
)
Change in short-term obligations, excluding current maturities
—

 
(790
)
 
(170
)
Other, net
(1,120
)
 
(893
)
 
(670
)
 
$
(2,917
)
 
$
(1,824
)
 
$
(4,439
)