Other Financial Information - Schedule of Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other Financial Information [Abstract]
Gas supply prepayment	$ 339	$ 377
Prepaid gas transmission contract	290	304
Value added tax credits	332	215
Deferred mining costs, net	149	149
Prepaid pension benefit	172	164
Goodwill	145	144
Noncurrent restricted cash	68	106
Noncurrent prepaid tax asset	74	78
Intangibles, net	31	35
Other	91	92
Other assets, noncurrent, total	$ 1,691	$ 1,664