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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

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- Definition

Tabular disclosure of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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