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Cash and cash equivalents and investment securities - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Restricted cash $ 77 $ 78
Amounts deposited on a blocked account 76  
Current debt securities 102 92
Debt securities [member]    
Disclosure of detailed information about borrowings [line items]    
Current debt securities 102 $ 92
Share Holder [member]    
Disclosure of detailed information about borrowings [line items]    
Cash acquired in business combination $ 1