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Debt - Asset-Backed Debt Narrative (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Debt Instrument [Line Items]                
Repayments of debt           $ 6,790 $ 1,475 $ 8,265
Asset-Backed Debt                
Debt Instrument [Line Items]                
Secured debt, carrying value $ 10,100       $ 10,100     $ 10,100
Asset Backed Notes                
Debt Instrument [Line Items]                
Revolving period               2 years
2020 ABS Financing Facility                
Debt Instrument [Line Items]                
Revolving period               1 year
Repayments of debt 1,300 $ 1,500   $ 1,300        
Amount drawn from credit facilities     $ 1,300          
Debt outstanding $ 500       500     $ 500
Secured Debt | Asset Backed Notes                
Debt Instrument [Line Items]                
Repayments of debt         $ 864     $ 2,700