| (2) | Changes in allowances for doubtful accounts of trade and other receivables for the years ended December 31, 2017 and 2016 are as follows: |
| (In millions of won) | ||||||||
| 2017 | 2016 | |||||||
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Balance at January 1 |
￦ | 369,332 | 344,016 | |||||
|
Bad debt expense |
40,377 | 78,132 | ||||||
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Write-offs |
(70,802 | ) | (79,891 | ) | ||||
|
Other |
23,264 | 27,075 | ||||||
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Balance at December 31 |
￦ | 362,171 | 369,332 | |||||
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