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Income taxes - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 19, 2022 case | Apr. 28, 2022 USD ($) | Jul. 31, 2021 USD ($) notice
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Interest and penalties related to unrecognized tax benefits recognized in income tax provision |  | $ 282,000,000 | $ 287,000,000 | $ 189,000,000 |  |  |
Accrued interest and penalties associated with unrecognized tax benefits |  | 1,600,000,000 | 1,400,000,000 |  |  |  |
Income taxes paid |  | 2,900,000,000 | $ 3,400,000,000 | $ 2,400,000,000 |  |  |
Internal Revenue Service (IRS) |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
IRS advance deposit | $ 800,000,000 |  |  |  |  |  |
Federal |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Tax credit carryforwards available to reduce income taxes |  | 195,000,000 |  |  |  |  |
NOL carryforwards available to reduce income taxes |  | 239,000,000 |  |  |  |  |
NOL carryforwards, valuation allowance |  | 0 |  |  |  |  |
NOLs with no valuation allowance and no expiration |  | 201,000,000 |  |  |  |  |
Number of notices on proposed additional tax | notice |  |  |  |  |  |  | 2
Number of notices consolidated in court | case |  |  |  |  | 2 |  |
Federal | Expiration in tax years between 2025 and 2044 |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Tax credit carryforwards, valuation allowance |  | 17,000,000 |  |  |  |  |
Federal | Tax Years 2010-2012 |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Proposed additional income tax |  |  |  |  |  |  | $ 3,600,000,000
Repatriation tax on proposed additional tax |  |  |  |  |  |  | $ 900,000,000
Federal | Tax Years 2013-2015 |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Proposed additional income tax |  |  |  |  |  | $ 5,100,000,000 |
Penalties on proposed additional income tax |  |  |  |  |  | 2,000,000,000 |
Repatriation tax on proposed additional tax |  |  |  |  |  | $ 2,200,000,000 |
State |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Tax credit carryforwards available to reduce income taxes |  | 1,200,000,000 |  |  |  |  |
Tax credit carryforwards, valuation allowance |  | 1,100,000,000 |  |  |  |  |
NOL carryforwards available to reduce income taxes |  | 957,000,000 |  |  |  |  |
NOL carryforwards, valuation allowance |  | 822,000,000 |  |  |  |  |
Foreign |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
Tax credit carryforwards available to reduce income taxes |  | 83,000,000 |  |  |  |  |
Tax credit carryforwards, valuation allowance |  | 53,000,000 |  |  |  |  |
NOL carryforwards available to reduce income taxes |  | 1,100,000,000 |  |  |  |  |
NOL carryforwards, valuation allowance |  | 164,000,000 |  |  |  |  |
NOLs with no valuation allowance and no expiration |  | 160,000,000 |  |  |  |  |
Foreign | Operating losses that expire between 2025 and 2033 |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |
NOL carryforwards, valuation allowance |  | $ 0 |  |  |  |  |

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