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Fair Value Measurement Of Assets And Liabilities (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Significant Other Observable Inputs (Level 2) [Member] | Loans Receivable, Net [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets | $ 1,848 | $ 1,260
Corporate Debt Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Proceeds from sale of available for sale securitites | 141 |
Cost | 15 |
Notes, 2026 And 2031 [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | 857 | 1,105
Convertible Senior Notes [Member] | 2028 Convertible Senior Notes [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities | $ 299 |
Convertible Senior Notes [Member] | Loans Payable And Other Financial Liabilities [Member] | 2028 Convertible Senior Notes [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Liabilities |  | $ 331

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