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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Accounting Policies [Abstract] |
Allowance for doubtful accounts receivable | The allowance for doubtful accounts related to accounts receivable and related activity are summarized below:
| December 31,
(In millions) | 2022 |  | 2021 |  | 2020
Balance at beginning of year | $ | 4 |  |  | $ | 4 |  |  | $ | 10 |
Provision | 1 |  |  | — |  |  | 1 |
Recoveries | — |  |  | — |  |  | (3) |
Write-offs charged against the allowance | — |  |  | — |  |  | (4) |
Balance at end of year | $ | 5 |  |  | $ | 4 |  |  | $ | 4 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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