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Schedule II - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule of Valuation and Qualifying Accounts Disclosure | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
|  |  | Additions |  |  |  |  |  |
| Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Deductions |  | Other Activity |  | Balance at End of Period
| (in millions)
December 31, 2018: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 34 |  |  | $ | 9 |  |  | $ | (7 | ) |  | $ | 2 |  |  | $ | 38 |
Tax valuation allowance (a) | $ | 1,008 |  |  | $ | 292 |  |  | $ | (120 | ) |  | $ | (2 | ) |  | $ | 1,178 |
December 31, 2017: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 33 |  |  | $ | 23 |  |  | $ | (24 | ) |  | $ | 2 |  |  | $ | 34 |
Tax valuation allowance (a) | $ | 1,399 |  |  | $ | — |  |  | $ | (406 | ) |  | $ | 15 |  |  | $ | 1,008 |
December 31, 2016: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 18 |  |  | $ | 22 |  |  | $ | (6 | ) |  | $ | (1 | ) |  | $ | 33 |
Tax valuation allowance (a) | $ | 706 |  |  | $ | 706 |  |  | $ | — |  |  | $ | (13 | ) |  | $ | 1,399 |
(a) | Additions Charged to Costs and Expenses are primarily related to taxable losses for which the tax benefit has been reserved.

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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