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Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - Senior Notes [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Interest expense incurred | $ 86 | $ 62 | $ 28
4.868% Senior Notes due 6/1/2044 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense incurred | $ 19 | 19 | 19
Debt instrument, stated interest rate | 4.868% |  |
3.5% Senior Notes due 10/15/2050 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense incurred | $ 35 | 35 | 8
Debt instrument, stated interest rate | 3.50% |  |
3.125% Senior Notes due 10/15/2052 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense incurred | $ 32 | $ 8 |
Debt instrument, stated interest rate | 3.125% |  |

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