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Supplemental Financial Information (Tables) | 6 Months Ended
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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 + Details
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