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Restructuring and Asset Related Charges Asset Impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  | $ 41 |
Other Asset Related [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Accelerated Prepaid Royalty Amortization Expense |  |  |  | $ 159
IPR&D [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 90 | $ 54 | 85 |
Impairment of Intangible Assets Indefinite lived Excluding Goodwill After Tax | $ 69 | $ 41 | $ 66 |

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- Definition Impairment of Intangible Assets Indefinite lived Excluding Goodwill After Tax + References No definition available. + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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