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Derivatives and Hedging Activities - Bifurcated Embedded Derivatives (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Embedded Derivative, Fair Value of Embedded Derivative Asset $ 1,361 $ 1,148
Embedded Derivative, Fair Value of Embedded Derivative Liability 1,715 1,717
Embedded Derivative, Fair Value of Embedded Derivative, Net Liability 354 569
Notional amount 48,027,695 39,750,315
Embedded Derivatives Classified In Debt [Member]    
Derivative [Line Items]    
Notional amount $ 11,280 $ 11,003