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Fair Value Measurements and Financial Instruments - Additional Information (Detail) € in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Apr. 27, 2023 USD ($)	Mar. 31, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	Mar. 31, 2022 USD ($)
Derivatives, Fair Value [Line Items]
Carrying amount of our investments without readily determinable fair values	$ 795,000,000				$ 804,000,000
Cumulative adjustments due to observable price changes	164,000,000
Cumulative adjustments due to impairment charges	88,000,000
Initial value of the excluded component							$ 1,000,000,000
Exchange gains and losses from the conversion of foreign currency denominated as debt	0
Derivative liability fair value of collateral	1,900,000,000				2,300,000,000
Derivative asset fair value of collateral	0				$ 0
TracFone Wireless, Inc.
Derivatives, Fair Value [Line Items]
Contingent consideration payment	$ 102,000,000
Scenario, Forecast \| Interest Expense
Derivatives, Fair Value [Line Items]
Excluded component estimated to be amortized into interest expense		$ 109,000,000
Treasury rate locks \| Cash Flow Hedging \| Designated as Hedging Instrument \| Subsequent Event
Derivatives, Fair Value [Line Items]
Notional amount			$ 500,000,000
Euro Denominated Debt \| Net Investment Hedges
Derivatives, Fair Value [Line Items]
Notional amount \| €				€ 750		€ 750