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Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Cost | $ 7,239 | $ 7,126
Accumulated Amortization | 2,503 | 2,306
Net Carrying Amount | 4,736 | 4,820
Client relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Cost | 6,752 | 6,650
Accumulated Amortization | 2,139 | 1,961
Net Carrying Amount | 4,613 | 4,689
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Cost | 487 | 476
Accumulated Amortization | 364 | 345
Net Carrying Amount | $ 123 | $ 131

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