Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 1,704	$ 1,407
Interest rate caps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	12,014	15,146
Interest rate caps | Subsidiary Issuers
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	5,800	5,900
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	8,900	10,300
Purchase
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 3,100	$ 4,900