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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
Tax Credit Carryforward [Line Items] |  |  |  |  |
Effective tax rate (as a percent) | 14.40% | 24.00% | 18.10% | 24.60% |
Unrecognized tax benefits that would affect the effective tax rate | $ 691 |  | $ 691 |  | $ 671
Deferred tax asset, noncurrent | 4,000 |  | 4,000 |  |
Deferred tax assets valuation allowance | 1,474 |  | 1,474 |  | $ 689
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 | $ 3,200 |  | $ 3,200 |  |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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