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Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Consolidated Balance Sheet Amount | $ 2,347,000,000 | $ 2,346,000,000
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Original Principal Amount | 2,400,000,000 |
Consolidated Balance Sheet Amount | 2,347,000,000 | 2,346,000,000
Market Value | $ 1,647,000,000 | 2,542,000,000
Senior Notes [Member] | 4.868% Senior Notes due 6/1/2044 [Member] |  |
Debt Instrument [Line Items] |  |
Date issued | Jun. 05, 2014 |
Date due | Jun. 01, 2044 |
Original Principal Amount | $ 400,000,000 |
Consolidated Balance Sheet Amount | 397,000,000 | 397,000,000
Market Value | $ 343,000,000 | 504,000,000
Debt instrument, stated interest rate | 4.868% |
Senior Notes [Member] | 3.5% Senior Notes due 10/15/2050 [Member] |  |
Debt Instrument [Line Items] |  |
Date issued | Oct. 07, 2020 |
Date due | Oct. 15, 2050 |
Original Principal Amount | $ 1,000,000,000 |
Consolidated Balance Sheet Amount | 981,000,000 | 980,000,000
Market Value | $ 677,000,000 | 1,055,000,000
Debt instrument, stated interest rate | 3.50% |
Senior Notes [Member] | 3.125% Senior Notes due 10/15/2052 [Member] |  |
Debt Instrument [Line Items] |  |
Date issued | Oct. 04, 2021 |
Date due | Oct. 15, 2052 |
Original Principal Amount | $ 1,000,000,000 |
Consolidated Balance Sheet Amount | 969,000,000 | 969,000,000
Market Value | $ 627,000,000 | $ 983,000,000
Debt instrument, stated interest rate | 3.125% |

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