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Unsecured Borrowings - Unsecured Short-Term Borrowings (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Current portion of unsecured long-term borrowings $ 26,077 $ 25,914
Hybrid financial instruments 22,850 18,823
Commercial Paper 10,710 6,085
Other unsecured short-term borrowings 2,103 2,048
Total unsecured short-term borrowings $ 61,740 $ 52,870
Weighted average interest rate 1.98% 1.84%