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Debt - Asset-Backed Debt Narrative (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 28, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 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   $ 10,600     10,600   $ 10,600
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   1,500   $ 1,300      
Amount drawn from credit facilities     $ 1,300        
Debt outstanding   $ 1,800     1,800   $ 1,800
Secured Debt | Asset Backed Notes              
Debt Instrument [Line Items]              
Repayments of debt         $ 883   $ 1,900
Secured Debt | Asset Backed Notes | Subsequent Event              
Debt Instrument [Line Items]              
Repayments of debt $ 137