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Contingencies and Commitments - Narrative (Details) $ in Millions, $ in Millions |  |  | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 01, 2019 USD ($) | Dec. 13, 2016 AUD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Number of actions filed |  |  |  | 2 |
Damages sought |  | $ 1,470 |  |  |
Damages awarded | $ 30 |  | $ (18) | $ (31) |
Contracts receivable |  |  |  | 205 | $ 166
Amount of disputed back charges |  |  |  | $ 2 | $ 18

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- Definition Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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