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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Income taxes |  |  |  |  |
Effective tax rate on income from continuing operations (as a percent) | 21.10% | 21.10% | 19.90% | 19.50% |
Valuation allowance, deferred tax assets | $ 66 |  | $ 66 |  | $ 65
Gross unrecognized tax benefits | 154 |  | 154 |  | 150
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized | 125 |  | 125 |  | 120
Additions to unrecognized tax benefits for tax positions of prior years |  | $ 71 |  |  |
Reductions to unrecognized tax benefits for tax positions of prior years |  | 80 |  |  |
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months | 8 |  | 8 |  |
Increase (decrease) in interest and penalties | 1 | $ 7 | 3 | $ 8 |
Payable related to accrued interest and penalties | 29 |  | 29 |  | 26
Estimated CAMT | 43 |  | 43 |  | $ 0
State net operating losses |  |  |  |  |
Income taxes |  |  |  |  |
Valuation allowance, deferred tax assets | 31 |  | 31 |  |
State deferred tax assets |  |  |  |  |
Income taxes |  |  |  |  |
Valuation allowance, deferred tax assets | 2 |  | 2 |  |
Foreign net operating losses |  |  |  |  |
Income taxes |  |  |  |  |
Valuation allowance, deferred tax assets | 33 |  | 33 |  |
State |  |  |  |  |
Income taxes |  |  |  |  |
Deferred tax assets, loss carryforwards | 32 |  | 32 |  |
Foreign |  |  |  |  |
Income taxes |  |  |  |  |
Deferred tax assets, loss carryforwards | $ 43 |  | $ 43 |  |

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