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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts |
Valuation and Qualifying Accounts | WASTE MANAGEMENT, INC. SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS (In Millions)
|  |  |  |  |  |  |  | Accounts |  |  |
|  | Balance |  | Charged |  | Written |  | Balance
|  | Beginning of |  | to |  | Off/Use of |  | End of
|  | Year |  | Income |  | Reserve |  | Year
2015 — Reserves for doubtful accounts (a) |  | $ | 31 |  | $ | 36 |  | $ | (42) |  | $ | 25
2016 — Reserves for doubtful accounts (a) |  | $ | 25 |  | $ | 42 |  | $ | (43) |  | $ | 24
2017 — Reserves for doubtful accounts (a) |  | $ | 24 |  | $ | 43 |  | $ | (45) |  | $ | 22
2015 — Merger and restructuring accruals (b) |  | $ | 45 |  | $ | 15 |  | $ | (47) |  | $ | 13
2016 — Merger and restructuring accruals (b) |  | $ | 13 |  | $ | 4 |  | $ | (10) |  | $ | 7
2017 — Merger and restructuring accruals (b) |  | $ | 7 |  | $ | — |  | $ | (5) |  | $ | 2
| (a) |  | Includes reserves for doubtful accounts receivable and notes receivable.
| (b) |  | Included in accrued liabilities in our Consolidated Balance Sheets. These accruals represent employee severance and benefit costs and transitional costs.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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