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Business Combination - Loans Identified as PCI Loans At Acquisition (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Mar. 22, 2019
Dec. 31, 2018
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period [Abstract]      
Contractually required payments including interest   $ 1,139  
Less: Nonaccretable difference   81  
Cash flows expected to be collected   1,058  
Less: Accretable yield $ 147 202 $ 0
Fair value of loans acquired   $ 856