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Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - Senior Notes [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Debt Instrument [Line Items] |  |  |  |
Interest expense incurred | $ 22 | $ 14 | $ 65 | $ 41
4.868% Senior Notes due 6/1/2044 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense incurred | $ 5 | 5 | $ 15 | 15
Debt instrument, stated interest rate | 4.868% |  | 4.868% |
3.5% Senior Notes due 10/15/2050 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense incurred | $ 9 | 9 | $ 26 | 26
Debt instrument, stated interest rate | 3.50% |  | 3.50% |
3.125% Senior Notes due 10/15/2052 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense incurred | $ 8 |  | $ 24 |
Debt instrument, stated interest rate | 3.125% |  | 3.125% |

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