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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
| Balance at | Credited/ | Charges | Balance at
| Beginning of | Charged to | Utilized/ | End of
(in millions) | Period | Net Income | Write-Offs | Period
Allowances for Doubtful Accounts and Authorized Credits |  |  |  |
Year ended December 31, 2018 | $ | — |  | 2 |  | (1 | ) | $ | 1 |
Year ended December 31, 2017 | $ | — |  | 1 |  | (1 | ) | $ | — |
Year ended December 31, 2016 | $ | 1 |  | 1 |  | (2 | ) | $ | — |
Tax Valuation Allowance |  |  |  |
Year ended December 31, 2018 | $ | 7 |  | — |  | — |  | $ | 7 |
Year ended December 31, 2017 | $ | 6 |  | 1 |  | — |  | $ | 7 |
Year ended December 31, 2016 | $ | 5 |  | 1 |  | — |  | $ | 6 |

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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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