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Investment Securities (Narrative) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Jan. 01, 2020
Schedule of Held-to-maturity Securities [Line Items]      
Consolidated assets $ 419,355,000,000 $ 294,005,000,000  
Held to maturity securities amortized cost 0 134,706,000,000 $ 134,700,000,000
Unrealized gain   1,758,000,000 $ 1,400,000,000
Available-for-sale, written down to fair value 0    
Writedown to fair value 0    
Available-for-sale, allowance for credit loss 0    
OTTI recognized in earnings or other comprehensive income   0  
Accrued interest for AFS securities 597,000,000    
Accrued interest for AFS and HTM securities   471,000,000  
Write-offs of accrued interest receivable on AFS securities 0 0  
Write-offs of accrued interest receivable on HTM securities   $ 0  
Deposits [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Fair value of pledged securities 1,300,000,000    
Federal Reserve Bank Advances [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Fair value of pledged securities 7,600,000,000    
Federal Home Loan Bank of San Francisco [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Fair value of pledged securities $ 36,900,000,000