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Schedule II: Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | GILEAD SCIENCES, INC. Schedule II: Valuation and Qualifying Accounts (in millions)
|  | Balance at Beginning of Period |  | Additions/Charged to Expense |  | Deductions |  | Balance at End of Period
Year ended December 31, 2017: |  |  |  |  |  |  |  |
Accounts receivable allowances (1) |  | $ | 763 |  |  | $ | 7,682 |  |  | $ | 7,990 |  |  | $ | 455 |
Sales return allowance |  | $ | 195 |  |  | $ | 23 |  |  | $ | 56 |  |  | $ | 162 |
Valuation allowances for deferred tax assets (2) |  | $ | 126 |  |  | $ | 72 |  |  | $ | 36 |  |  | $ | 162 |
Year ended December 31, 2016: |  |  |  |  |  |  |  |
Accounts receivable allowances (1) |  | $ | 1,032 |  |  | $ | 9,287 |  |  | $ | 9,556 |  |  | $ | 763 |
Sales return allowance |  | $ | 371 |  |  | $ | (141 | ) |  | $ | 35 |  |  | $ | 195 |
Valuation allowances for deferred tax assets (2) |  | $ | 6 |  |  | $ | 120 |  |  | $ | — |  |  | $ | 126 |
Year ended December 31, 2015: |  |  |  |  |  |  |  |
Accounts receivable allowances (1) |  | $ | 356 |  |  | $ | 6,934 |  |  | $ | 6,258 |  |  | $ | 1,032 |
Sales return allowance |  | $ | 171 |  |  | $ | 219 |  |  | $ | 19 |  |  | $ | 371 |
Valuation allowances for deferred tax assets (2) |  | $ | 9 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 6 |
_______________________ |  |  |  |  |  |  |  |
Notes:
(1) | Allowances are for doubtful accounts, cash discounts and chargebacks.
(2) | Valuation allowances for deferred tax assets include $48 million, $4 million and $4 million as of December 31, 2017, 2016 and 2015, respectively, related to our acquisitions.

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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 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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