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Valuation And Qualifying Accounts And Reserves (Schedule Of Valuation And Qualifying Accounts) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-09, Allowance, Credit Loss |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |  |  |
Balance at Beginning of Year | $ 199 | $ 122 | $ 100
Additions | 6 | 88 | 32
Deductions | (28) | (12) | (28)
Balance at End of Year | 215 | 199 | 122
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 215 | 199 | 122
Additions | 6 | 88 | 32
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | 28 | 12 | 28
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment | 38 | 1 | 18
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment | 38 | 1 | 18
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |  |  |
Balance at Beginning of Year | 209 | 281 | 339
Additions | 58 | 18 | 7
Deductions | (51) | (90) | (65)
Balance at End of Year | 216 | 209 | 281
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 216 | 209 | 281
Additions | 58 | 18 | 7
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | 51 | 90 | 65
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment | 0 | 0 | 0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment | $ 0 | $ 0 | $ 0

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