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Debt - Asset-Backed Debt Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2023
Debt Instrument [Line Items]
Repayments of debt	$ 810	$ 1,040	$ 1,850
Asset-Backed Debt
Debt Instrument [Line Items]
Secured debt, carrying value			21,000
Secured Debt | Asset Backed Notes
Debt Instrument [Line Items]
Repayments of debt			$ 3,000
Secured Debt | Asset Backed Notes | Term One
Debt Instrument [Line Items]
Revolving period			18 months
Secured Debt | Asset Backed Notes | Term Two
Debt Instrument [Line Items]
Revolving period			2 years
Secured Debt | Asset Backed Notes | Term Three
Debt Instrument [Line Items]
Revolving period			3 years
Secured Debt | Asset Backed Notes | Term Four
Debt Instrument [Line Items]
Revolving period			5 years

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