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Risks Arising from Financial Instruments - Summary of Offsetting Financial Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Gross amount $ 842 $ 362
Net amount recognized in the statement of financial position 842 362
Other offsetting agreements (837) (352)
Total net amount 5 10
Derivative liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Gross amount (6,864) (4,151)
Net amount recognized in the statement of financial position (6,864) (4,151)
Other offsetting agreements 837 352
Total net amount $ (6,027) $ (3,799)