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Debt - Asset-Backed Debt Narrative (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2025
Debt Instrument [Line Items]
Repayments of debt	$ 1,398	$ 2,158	$ 1,978	$ 5,534
Asset-Backed Debt
Debt Instrument [Line Items]
Secured debt, carrying value	$ 27,100			27,100
Secured Debt | Asset Backed Notes
Debt Instrument [Line Items]
Repayments of debt				$ 3,200
Secured Debt | Asset Backed Notes | Term One
Debt Instrument [Line Items]
Revolving period				2 years
Secured Debt | Asset Backed Notes | Term Two
Debt Instrument [Line Items]
Revolving period				3 years
Secured Debt | Asset Backed Notes | Term Three
Debt Instrument [Line Items]
Revolving period				5 years

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