Derivatives (Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral) (Detail) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Commodity derivatives | Other current assets
Derivative [Line Items]
Asset		$ 415	$ 310
Liability		469	301
Embedded derivatives in commodity contracts | Other current liabilities
Derivative [Line Items]
Asset		0	0
Liability	[1]	11	10
Embedded derivatives in commodity contracts | Deferred credits and other liabilities
Derivative [Line Items]
Asset		0	0
Liability	[1]	$ 47	$ 51

[1] Includes embedded derivatives.