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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Goodwill and Other Intangible Assets) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2025
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Goodwill impairment loss |  |  | $ 675,000,000 |  |
GMPD |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Goodwill impairment loss | $ 90,000,000 | $ 585,000,000 | $ 675,000,000 | $ 1,200,000,000 |
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Operating Income (Loss) | Operating Income (Loss) |
Minimum |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Discount Rate, fair value inputs |  |  |  |  | 9.50%
Maximum |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Discount Rate, fair value inputs |  |  |  |  | 11.00%

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