XML 37 R26.htm IDEA: XBRL DOCUMENT v3.21.2
Supplemental Financial Information (Tables)
6 Months Ended
Jun. 30, 2021
Supplemental Financial Information  
Summary of activity of allowance for doubtful accounts

(in millions)

    

Allowance for Doubtful Accounts:

Balance at December 31, 2020

$

288

Provisions/charges to income

31

Amounts charged off and other deductions

 

(9)

Balance at June 30, 2021

$

310

Schedule of long-term investments

June 30, 

December 31, 

(in millions)

    

2021

    

2020

Long-term Investments:

Equity securities

$

754

$

776

Other

 

51

 

45

Total

$

805

$

821