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Debt Obligations - Schedule of Short-term Debt (Parenthetical) (Detail) - USD ($)
$ in Millions
Jul. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Senior notes   $ 25,183 $ 25,490
Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior notes $ 1,475    
Weighted average interest rate 2.20%