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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] |
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
(in millions) |  | Balance at Beginning of Year |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Year
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 47 |  |  | $ | 10 |  |  | $ | (1 | ) |  | $ | (8 | ) |  | $ | 48 |
Deferred tax asset valuation allowance |  | $ | 2,913 |  |  | $ | 13 |  |  | $ | (95 | ) |  | $ | — |  |  | $ | 2,831 |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 97 |  |  | $ | 4 |  |  | $ | (4 | ) |  | $ | (50 | ) |  | $ | 47 |
Deferred tax asset valuation allowance |  | $ | 2,001 |  |  | $ | 870 |  |  | $ | 42 |  |  | $ | — |  |  | $ | 2,913 |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 80 |  |  | $ | 33 |  |  | $ | 4 |  |  | $ | (20 | ) |  | $ | 97 |
Deferred tax asset valuation allowance |  | $ | 1,857 |  |  | $ | 221 |  |  | $ | (77 | ) |  | $ | — |  |  | $ | 2,001 |

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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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