Other Financial Information - Schedule of Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Other Financial Information [Abstract]
Prepaid gas transmission contract	$ 278	$ 297
Gas supply prepayment	225	283
Value-added tax credits	213	336
Deferred mining costs, net	184	187
Goodwill	142	146
Prepaid pension benefit	128	125
IRA Section 45X credit	71	0
Noncurrent prepaid tax asset	66	73
Noncurrent restricted cash	53	71
Intangibles, net	36	37
Other	101	95
Other assets, noncurrent, total	$ 1,497	$ 1,650