Other Financial Information - Schedule of Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Other Financial Information [Abstract]
Gas Supply Prepayment	$ 303	$ 311
Value added tax credits	301	294
Prepaid gas transmission contract	286	285
Deferred mining costs, net	163	161
Prepaid pension benefit	152	146
Goodwill	145	145
Noncurrent prepaid tax asset	72	72
Noncurrent restricted cash	55	56
Intangibles, net	30	29
Other	98	94
Other assets, noncurrent, total	$ 1,605	$ 1,593