Asset Retirement Obligations and Accrued Environmental Costs - Summary of Asset Retirement Obligations and Accrued Environmental Costs (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligations	$ 484	$ 464
Accrued environmental costs	23	23
Total asset retirement obligations and accrued environmental costs	507	487
Less: asset retirement obligations and accrued environmental costs due within one year	34	18
Asset retirement obligations and accrued environmental costs due after one year	$ 473	$ 469