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Amount of liability hedged in fair value hedging relationship.

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Fair Value Measurements and Financial Instruments - Additional Information (Detail) € in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)	Mar. 31, 2022 USD ($)
Derivatives, Fair Value [Line Items]
Carrying amount of our investments without readily determinable fair values		$ 764,000,000	$ 804,000,000
Cumulative adjustments due to observable price changes		209,000,000
Cumulative adjustments due to impairment charges		98,000,000
Initial value of the excluded components						$ 1,000,000,000
Hedged Liability, Statement of Financial Position [Extensible Enumeration]						Other liabilities
Derivative asset fair value of collateral		0	0
Collateral payments related to derivative contracts		1,406,000,000	2,286,000,000
Scenario, Forecast \| Interest Expense
Derivatives, Fair Value [Line Items]
Excluded components	$ 104,000,000
TracFone Wireless, Inc.
Derivatives, Fair Value [Line Items]
Contingent consideration payment		$ 257,000,000	$ 188,000,000
Euro-denominated debt \| Net Investment Hedges
Derivatives, Fair Value [Line Items]
Notional amount \| €				€ 750	€ 750