Other Financial Information - Schedule of Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Other Financial Information [Abstract]
Value added tax credits	$ 336	$ 294
Prepaid gas transmission contract	277	285
Gas Supply Prepayment	275	311
Deferred mining costs, net	170	161
Prepaid pension benefit	159	146
Goodwill	146	145
Noncurrent prepaid tax asset	68	72
Noncurrent restricted cash	54	56
Intangibles, net	37	29
Other	96	94
Other assets, noncurrent, total	$ 1,618	$ 1,593