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Debt - Asset-Backed Debt Narrative (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 25, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2024
Debt Instrument [Line Items]          
Repayments of debt   $ 362 $ 796 $ 2,028 $ 3,186
Asset-Backed Debt          
Debt Instrument [Line Items]          
Secured debt, carrying value   $ 24,300     24,300
Secured Debt | Asset Backed Notes          
Debt Instrument [Line Items]          
Repayments of debt         $ 2,200
Secured Debt | Asset Backed Notes | Subsequent Event          
Debt Instrument [Line Items]          
Repayments of debt $ 1,400        
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