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Receivables, net | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Receivables, net | 4. Receivables, net Receivables are recorded and carried at the original invoiced amount less an allowance for doubtful accounts. Activity in the allowance for doubtful accounts was as follows (in millions):
|  | December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 16 |  |  | $ | 27 |  |  | $ | 29 |
Cumulative effect of accounting change |  |  | 6 |  |  |  | — |  |  |  | — |
Additions (deductions) charged to expenses |  |  | 9 |  |  |  | (2 | ) |  |  | 2 |
Charge-offs and other |  |  | (3 | ) |  |  | (9 | ) |  |  | (4 | )
Ending balance |  | $ | 28 |  |  | $ | 16 |  |  | $ | 27 |

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- Definition The entire disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
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- References No definition available. + Details
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