Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 1,407	$ 1,160
Interest rate caps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	15,146	14,219
Interest rate caps | Subsidiary Issuers
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	5,900	6,200
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	750	1,450
Interest rate caps sold
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	10,300	9,800
Purchase
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 4,900	$ 4,400