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Acquisitions - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
branch
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 19, 2018
USD ($)
Mar. 12, 2018
USD ($)
Business Acquisition [Line Items]            
Goodwill and intangible assets   $ 182 $ 190      
Wells Fargo Branches Acquisition            
Business Acquisition [Line Items]            
Number of bank branches acquired | branch 52          
Goodwill $ 58          
Acquisition-related costs expensed in period   $ 1 $ 15      
Pro forma reclassification of acquisition-related expenses       $ 16    
Pro forma reclassification of hedging gains       $ 29    
Loans 107          
Deposits $ 1,761          
Wells Fargo Branches Acquisition | Core Deposits Intangible            
Business Acquisition [Line Items]            
Estimated useful life 10 years          
Santander Bank And Desert Community Bank Acquisitions            
Business Acquisition [Line Items]            
Goodwill and intangible assets         $ 51  
Santander Bank Mortgage Loan Warehouse Business            
Business Acquisition [Line Items]            
Loans           $ 499
Commitments           $ 1,700
Desert Community Bank Branch Acquisition            
Business Acquisition [Line Items]            
Loans         59  
Deposits         $ 614