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Fair Value Measurements and Financial Instruments - Notional Amounts of Outstanding Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Interest rate swaps
Derivative [Line Items]
Notional amount	$ 23,040	$ 24,025
Cross currency swaps
Derivative [Line Items]
Notional amount	32,177	32,053
Treasury rate locks | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	6,000	0
Foreign exchange forwards
Derivative [Line Items]
Notional amount	$ 750	$ 620

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
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-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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