Supplementary Information - Interest and Other Income, Net (Detail) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting [Abstract]
Earnings of equity method investments				$ 182	$ 206	$ 164
Interest income				174	100	99
Gain on sale of investment	[1]			24
Gain on sale of Liberty shares	[1]			0	36	325
Loss on Blue Chip Swap transactions	[1]					(139)
Gain on ADC equity investment		$ 24				107	[1]
Gain on sale of real estate	[1]					43
Gain on repurchase of bonds			$ 11			11	[1]
Interest and other income, net				$ 380	$ 342	$ 610

[1] See Note 3 – Charges and Credits