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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | [1] | Jun. 30, 2019 | [1] | Mar. 31, 2019 | [1] | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 01, 2019
Integration and Separation Costs | $ 50 | [1] | $ 152 | $ 330 | $ 212 | $ 0 | $ 744 | $ 992 |
Restricted Cash |  |  |  |  |  |  |  |  | $ 319
Percentage of FIFO Inventory | 59.00% |  |  |  |  | 62.00% | 59.00% |  |
Percentage of Weighted Average Cost Inventory | 41.00% |  |  |  |  | 38.00% | 41.00% |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Definite-Lived Intangible Asset, Useful Life |  |  |  |  |  | 2 years |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Definite-Lived Intangible Asset, Useful Life |  |  |  |  |  | 25 years |  |  |
Other Current Assets [Member] |  |  |  |  |  |  |  |  |
Prepaid Royalties |  |  |  |  |  | $ 426 |  |  |
Restricted Cash | $ 409 |  |  |  |  | 347 | $ 409 |  |
Other Assets [Member] |  |  |  |  |  |  |  |  |
Prepaid Royalties - Long-Term |  |  |  |  |  | $ 459 |  |  |
[1] | See Note 2 - Summary of Significant Accounting Polices, Note 7 - Restructuring and Asset Related Charges - Net, Note 5 - Divestitures and Other Transactions, and Note 15 - Goodwill and Other Intangible Assets, to the Consolidated Financial Statements for additional information related to integration and separation costs, restructuring and asset related charges - net, and discontinued operations, respectively.

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- Definition Integration and separation costs includes costs incurred to prepare for and close the Merger, post-Merger integration expenses and costs incurred to prepare for the Intended Business Separations. These costs primarily consist of financial advisory, information technology, legal, accounting, consulting and other professional advisory fees associated with preparation and execution of these activities. + References No definition available. + Details
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