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SEC Schedule, Article 12-09, Valuation and Qualifying Accounts | 12 Months Ended
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Sep. 30, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
|  | Year Ended September 30,
(in millions) |  | 2020 |  | 2019 |  | 2018
Accounts Receivable - Allowance for Doubtful Accounts |  |  |  |  |  |
Balance at beginning of period |  | $ | 14 |  |  | $ | 15 |  |  | $ | 20 |
Provision charged to costs and expenses |  | 15 |  |  | 15 |  |  | 12 |
Reserve adjustments |  | (19) |  |  | (16) |  |  | (17) |
Balance at end of period |  | $ | 10 |  |  | $ | 14 |  |  | $ | 15 |
Deferred Tax Assets - Valuation Allowance |  |  |  |  |  |
Balance at beginning of period |  | $ | 1,304 |  |  | $ | 846 |  |  | $ | 223 |
Allowance provision for operating and other loss carryforwards |  | 346 |  |  | 488 |  |  | 669 |
Allowance provision (benefit) adjustments |  | 6 |  |  | (30) |  |  | (46) |
Balance at end of period |  | $ | 1,656 |  |  | $ | 1,304 |  |  | $ | 846 |

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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=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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