Commitments and Contingencies (Charitable Commitments) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Other Deferred Credits and Other Liabilities
Recorded Unconditional Purchase Obligation [Line Items]
Charitable commitments	$ 32	$ 8
Other Current Liabilities
Recorded Unconditional Purchase Obligation [Line Items]
Charitable commitments	21	$ 6
Other Income
Recorded Unconditional Purchase Obligation [Line Items]
Charitable expenses	72
Charitable expenses after tax	$ 54