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Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Feb. 28, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |
Investments |  | $ 71 |  |  | $ 72
Disposed of by Sale |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Assets held for sale |  |  |  | $ 13 |
Gain (loss) on write down of assets held for sale |  | 2 |  |  |
Amount of consideration received | $ 15 |  |  |  |
Restructuring and other related charges |  | 7 |  |  |
Royalty fee |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revenue |  | $ 34 | $ 40 |  |

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