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Organization and Basis of Presentation (Tables) | 3 Months Ended
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Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Activity in the allowance for uncollectible accounts on customer receivables | Activity in the allowance for uncollectible accounts on customer receivables for the three months ended March 31, 2021 and for the year ended December 31, 2020 are as follows:
|  | (In millions)
Balance, January 1, 2020 |  | $ | 46 |
Charged to income (1) |  | 174 |
Charged to other accounts (2) |  | 46 |
Write-offs |  | (102) |
Balance, December 31, 2020 |  | $ | 164 |
Charged to income |  | 5 |
Charged to other accounts (2) |  | 11 |
Write-offs |  | (19) |
Balance, March 31, 2021 |  | $ | 161 |
(1) $103 million of which was deferred for future recovery in the twelve months ended December 31, 2020. (2) Represents recoveries and reinstatements of accounts written off for uncollectible accounts.

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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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