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Debt - Asset-Backed Debt Narrative (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 08, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Agreement
Asset-Backed Debt      
Debt Instrument [Line Items]      
Secured debt, carrying value   $ 11,300 $ 11,300
Asset Backed Notes      
Debt Instrument [Line Items]      
Debt revolving period     2 years
2018 ABS Financing Facility      
Debt Instrument [Line Items]      
Debt revolving period     1 year
Repayments of debt   540  
2019 ABS Financing Facility      
Debt Instrument [Line Items]      
Debt revolving period     2 years
Repayments of debt   671  
Debt outstanding   1,800 $ 1,800
Number of loan agreements | Agreement     2
Senior asset-backed notes | Asset Backed Notes      
Debt Instrument [Line Items]      
Repayments of debt   $ 794 $ 1,400
Subsequent Event | 2019 ABS Financing Facility      
Debt Instrument [Line Items]      
Repayments of debt $ 1,500