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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Effective tax rate (as a percent) | 20.30% |  | 23.50% | 19.00% | 24.30% |
Unrecognized tax benefits that would affect the effective tax rate | $ 710 |  |  | $ 710 |  | $ 671
Deferred tax asset, noncurrent | 3,900 |  |  | 3,900 |  |
Deferred tax assets valuation allowance | 1,100 |  |  | 1,100 |  | $ 700
Undistributed earnings not permanently reinvested |  | $ 100 |  |  |  |
Deferred tax on undistributed foreign earnings | 1,000 |  |  | 1,000 |  |
PWS Settlement |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Deferred tax assets | $ 3,000 |  |  | $ 3,000 |  |

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