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Income taxes - Narrative (Details)	3 Months Ended	12 Months Ended
Income taxes - Narrative (Details)	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