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Debt Obligations - Schedule of Short-term Debt (Parenthetical) (Detail)
€ in Millions, $ in Millions
Jul. 31, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Senior notes | $   $ 25,846   $ 26,496
Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes | € € 1,010   € 700  
Weighted average interest rate 0.375%   2.25%