Other Financial Information - Schedule of Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Financial Information [Abstract]
Gas supply prepayment	$ 377	$ 439
Prepaid gas transmission contract	304	315
Value-added tax credits	215	134
Deferred mining costs, net	149	136
Prepaid pension benefit	164
Goodwill	144	145
Noncurrent restricted cash	106
Noncurrent prepaid tax asset	78	82
Intangibles, net	35	45
Other	92	148
Other assets, noncurrent, total	$ 1,664	$ 1,444