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Income taxes (Textual) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | May 31, 2021 USD ($)
Tax Credit Carryforward [Line Items] |  |  |  |
Interest and penalties related to unrecognized tax benefits recognized in income tax provision | $ 98,000,000 | $ 116,000,000 | $ 198,000,000 |
Accrued interest and penalties associated with unrecognized tax benefits | 881,000,000 | 783,000,000 |  |
Income taxes paid | 1,900,000,000 | $ 1,400,000,000 | $ 1,900,000,000 |
Federal [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforwards available to reduce income taxes | 75,000,000 |  |  |
NOL carryforwards available to reduce income taxes | 606,000,000 |  |  |
NOL carryforwards, valuation allowance | 6,000,000 |  |  |
NOLs with no valuation allowance and no expiration | 426,000,000 |  |  |
Proposed additional income tax |  |  |  | $ 3,600,000,000
Repatriation tax on proposed additional tax |  |  |  | $ 900,000,000
Number of notices on proposed additional tax |  |  |  | 2
Federal [Member] | Expiration in tax years between 2023 and 2040 |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforwards, valuation allowance | 0 |  |  |
Federal [Member] | Operating Losses That Expire Between 2022 and 2037 |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
NOL carryforwards, valuation allowance | 0 |  |  |
State [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforwards available to reduce income taxes | 798,000,000 |  |  |
Tax credit carryforwards, valuation allowance | 709,000,000 |  |  |
NOL carryforwards available to reduce income taxes | 391,000,000 |  |  |
NOL carryforwards, valuation allowance | 330,000,000 |  |  |
Foreign [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
NOL carryforwards available to reduce income taxes | 2,000,000,000 |  |  |
NOL carryforwards, valuation allowance | 561,000,000 |  |  |
NOLs with no valuation allowance and no expiration | 800,000,000 |  |  |
Foreign [Member] | Operating Losses That Expire Between 2022 and 2031 |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
NOL carryforwards, valuation allowance | $ 0 |  |  |

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