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Income Taxes - Income Tax Provision (Benefit) Differed from Amounts Computed at the Statutory Federal Income Tax Rate and Significant Components (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Income tax provision (benefit) at statutory rate | $ 711 | $ 208 | $ (537)
State income tax provision (benefit), net of federal income tax benefit | 46 | 13 | (34)
Nondeductible employee meals | 15 | 12 | 7
Nondeductible transportation fringe benefit | 13 | 10 | 8
Valuation allowance | (21) | (10) | (38)
Other, net | 5 | 20 | 1
Income tax expense (benefit) | 769 | 253 | (593)
Current | 13 | 5 | (10)
Deferred | $ 756 | $ 248 | $ (583)

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