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Derivatives and Hedging Activities - Bifurcated Embedded Derivatives (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Embedded Derivative, Fair Value of Embedded Derivative Asset $ 1,144 $ 980
Embedded Derivative, Fair Value of Embedded Derivative Liability 1,638 1,297
Embedded Derivative, Fair Value of Embedded Derivative, Net Liability 494 317
Notional amount 50,331,958 42,481,244
Embedded Derivatives Classified In Debt [Member]    
Derivative [Line Items]    
Notional amount $ 10,979 $ 10,229