Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 1,578	$ 1,704
Interest rate caps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	11,390	12,014
Interest rate caps | Subsidiary Issuers
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	3,300	5,800
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	750	750
Interest rate caps sold
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	7,100	8,900
Purchase
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 4,300	$ 3,100