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Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  | $ 1,964,000,000 | $ 1,964,000,000 |  | $ 1,964,000,000 | $ 1,964,000,000 | $ 12,657,000,000 |  |
Indefinite-lived intangible assets |  | 9,000,000 | 9,000,000 |  | 9,000,000 | 9,000,000 |  |  |
Finite-lived intangible assets, net |  | 4,797,000,000 |  |  | 4,797,000,000 |  |  |  |
Total other intangible assets, net |  | 4,806,000,000 | 5,470,000,000 |  | 4,806,000,000 | 5,470,000,000 |  |  |
Goodwill impairment | $ 1,900,000,000 | 0 |  | $ 8,800,000,000 | 0 | 10,693,000,000 | $ 3,271,000,000 |  |
Customer Relationships |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  | 3,196,000,000 | 3,811,000,000 |  | 3,196,000,000 | 3,811,000,000 |  |  |
Accumulated amortization |  | 4,504,000,000 | 4,248,000,000 |  | 4,504,000,000 | 4,248,000,000 |  |  |
Loss on sale of intangible assets |  |  | 73,000,000 |  |  | 121,000,000 |  |  |
Capitalized Software |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  | 1,529,000,000 | 1,564,000,000 |  | 1,529,000,000 | 1,564,000,000 |  |  |
Accumulated amortization |  | 4,067,000,000 | 4,045,000,000 |  | 4,067,000,000 | 4,045,000,000 |  |  |
Patents and Other |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, net |  | 72,000,000 | 86,000,000 |  | 72,000,000 | 86,000,000 |  |  |
Accumulated amortization |  | $ 86,000,000 | $ 72,000,000 |  | $ 86,000,000 | $ 72,000,000 |  |  |
Fully Amortized and Retired Capitalized Software |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets, gross carrying value |  |  |  |  |  |  |  | $ 352,000,000 | $ 183,000,000
Fully Amortized and Retired Trade Names |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets, gross carrying value |  |  |  |  |  |  |  | $ 153,000,000 | $ 130,000,000

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