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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Assets:        
Cash and cash equivalents, Carrying Value $ 2,211 $ 1,948 $ 742 $ 1,475
Cash and cash equivalents, Estimated Fair Value 2,211 1,948    
FHLB stock, Carrying Value [1] 734 714    
FHLB stock, Estimated Fair Value [1] 734 714    
Loans and leases, net, Carrying Value 45,539 42,807    
Loans and leases, net, Estimated Fair Value 44,748 42,376    
Financial Liabilities:        
Deposits, Carrying Value 35,059 32,437    
Deposits, Estimated Fair Value 35,051 32,466    
Borrowed funds, Carrying Value 16,562 16,084    
Borrowed funds, Estimated Fair Value 17,169 16,794    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial Assets:        
Cash and cash equivalents, Carrying Value 2,211 1,947,931    
Financial Liabilities:        
Deposits, Carrying Value 26,635 [2] 22,106 [3]    
Significant Other Observable Inputs (Level 2)        
Financial Assets:        
FHLB stock, Carrying Value 734 [4] 714 [1]    
Financial Liabilities:        
Deposits, Carrying Value 8,416 [5] 10,360 [6]    
Borrowed funds, Carrying Value 17,169 16,794    
Significant Unobservable Inputs (Level 3)        
Financial Assets:        
Loans and leases, net, Carrying Value $ 44,748 $ 42,376    
[1] Carrying value and estimated fair value are at cost.
[2] Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[3] Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[4] Carrying value and estimated fair value are at cost.
[5] Certificates of deposit.
[6] Certificates of deposit.