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v3.19.3.a.u2

Receivables (Tables) | 12 Months Ended
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Dec. 31, 2019
Transfers and Servicing [Abstract] |
Schedule of Allowance for Doubtful Accounts | The following table details the changes in the allowance for doubtful accounts related to customer receivables and other receivables:
| Customer receivables |  | Other receivables
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Balance at beginning of year | $ | 4 |  |  | $ | 8 |  |  | $ | 13 |  |  | $ | 31 |  |  | $ | 34 |  |  | $ | 32 |
Provision for doubtful accounts | 3 |  |  | 2 |  |  | 1 |  |  | 13 |  |  | 7 |  |  | 9 |
Write off of uncollectible accounts | (2 | ) |  | (2 | ) |  | (5 | ) |  | (2 | ) |  | (2 | ) |  | (1 | )
Recoveries of prior write-offs | — |  |  | — |  |  | — |  |  | (5 | ) |  | (3 | ) |  | (3 | )
Other | (2 | ) |  | (4 | ) |  | (1 | ) |  | (4 | ) |  | (5 | ) |  | (3 | )
Balance at end of year | $ | 3 |  |  | $ | 4 |  |  | $ | 8 |  |  | $ | 33 |  |  | $ | 31 |  |  | $ | 34 |

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