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Schedule II: Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2019
SEC Schedule, 12-09, 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, 2019: |  |  |  |  |  |  |  |
Accounts receivable allowances(1) |  | $ | 583 |  |  | $ | 7,514 |  |  | $ | 7,339 |  |  | $ | 758 |
Sales return allowance |  | $ | 159 |  |  | $ | 121 |  |  | $ | 143 |  |  | $ | 137 |
Valuation allowances for deferred tax assets |  | $ | 331 |  |  | $ | 3 |  |  | $ | 117 |  |  | $ | 217 |
Year ended December 31, 2018: |  |  |  |  |  |  |  |
Accounts receivable allowances(1) |  | $ | 455 |  |  | $ | 7,572 |  |  | $ | 7,444 |  |  | $ | 583 |
Sales return allowance |  | $ | 162 |  |  | $ | 85 |  |  | $ | 88 |  |  | $ | 159 |
Valuation allowances for deferred tax assets |  | $ | 162 |  |  | $ | 170 |  |  | $ | 1 |  |  | $ | 331 |
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 |  | $ | 126 |  |  | $ | 72 |  |  | $ | 36 |  |  | $ | 162 |
_________________________________________ |  |  |  |  |  |  |  |
(1) Allowances are for doubtful accounts, cash discounts and chargebacks.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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