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Contingencies (Federal Government's Lawsuit) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2022 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual, provision |  |  |  |  | $ 90
Federal Government's Lawsuit |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, corrective statements in newspapers, period |  |  | 4 months |  |
Loss contingency, corrective statements on television, period |  |  | 1 year |  |
Loss contingency, corrective statements, onserts total period |  | 2 years |  |  |
Implementation of Corrective Communications [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency, corrective statements, onserts period |  | 14 days |  |  |
Loss contingency, corrective statements, onserts consecutive total period |  | 3 months |  |  |
Implementation of Corrective Communications [Member] | Federal Government's Lawsuit |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual, provision | $ 15 |  |  | $ 28 |

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