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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of trading securities | $ 1,800 | $ 1,800
Net gains (losses) on marketable securities | 170 | 240
Outstanding principal amount of debt instruments | 21,557 | 18,723
Unamortized discounts and issuance costs | 1,287 | 1,264
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated fair values of debt instruments | 20,200 | 18,500
Interest rate swaps | Designated as hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate notional amount of derivatives | 1,300 | 1,300
Foreign currency contracts | Designated as hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate notional amount of derivatives | $ 7,500 | $ 6,500

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