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Fair Value Measurements and Financial Instruments - Additional Information (Detail) € in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	Mar. 31, 2022 USD ($)
Derivatives, Fair Value [Line Items]
Carrying amount of our investments without readily determinable fair values	$ 721,000,000				$ 804,000,000
Cumulative adjustments due to observable price changes	159,000,000
Cumulative adjustments due to impairment charges	89,000,000
Initial value of the excluded component							$ 1,000,000,000
Derivative liability fair value of collateral	2,100,000,000				2,300,000,000
Derivative asset fair value of collateral	0				$ 0
TracFone Wireless, Inc.
Derivatives, Fair Value [Line Items]
Contingent consideration payment	$ 182,000,000	$ 113,000,000
Scenario, Forecast | Interest Expense
Derivatives, Fair Value [Line Items]
Excluded component estimated to be amortized into interest expense			$ 106,000,000
Euro Denominated Debt | Net Investment Hedges
Derivatives, Fair Value [Line Items]
Notional amount | €				€ 750		€ 750

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