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Business Combination - Loans Identified as PCI Loans At Acquisition (Detail)
$ in Millions
Mar. 22, 2019
USD ($)
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 202
Fair value of loans acquired $ 856