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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Available for sale securities    
Amortized Cost [1] $ 116,336 $ 160,162
Gross Unrealized Gains 1 0
Gross Unrealized Losses 8,691 12,291
Total available for sale securities [1] 107,646 147,871
Unallocated portfolio layer method fair value basis adjustments, Amortized Cost (19)  
Unallocated portfolio layer method fair value basis adjustments, Gross Unrealized Gains 0  
Unallocated portfolio layer method fair value basis adjustments, Gross Unrealized Losses (19)  
Held to maturity securities    
Amortized Cost [1] 159,452 173,074
Gross Unrealized Gains 1,435 1,442
Gross Unrealized Losses 13,796 15,580
Fair Value 147,091 158,936
U.S. agency mortgage-backed securities    
Available for sale securities    
Amortized Cost 69,173 85,994
Gross Unrealized Gains 0 0
Gross Unrealized Losses 6,378 8,306
Total available for sale securities 62,795 77,688
Held to maturity securities    
Amortized Cost 159,452 173,074
Gross Unrealized Gains 1,435 1,442
Gross Unrealized Losses 13,796 15,580
Fair Value 147,091 158,936
U.S. Treasury securities    
Available for sale securities    
Amortized Cost 22,459 41,879
Gross Unrealized Gains 1 0
Gross Unrealized Losses 989 1,877
Total available for sale securities 21,471 40,002
Corporate debt securities    
Available for sale securities    
Amortized Cost 13,344 13,830
Gross Unrealized Gains 0 0
Gross Unrealized Losses 860 1,275
Total available for sale securities 12,484 12,555
Asset-backed securities    
Available for sale securities    
Amortized Cost 9,465 13,672
Gross Unrealized Gains 0 0
Gross Unrealized Losses 378 649
Total available for sale securities 9,087 13,023
Foreign government agency securities    
Available for sale securities    
Amortized Cost 1,035 1,033
Gross Unrealized Gains 0 0
Gross Unrealized Losses 33 64
Total available for sale securities 1,002 969
U.S. state and municipal securities    
Available for sale securities    
Amortized Cost 634 713
Gross Unrealized Gains 0 0
Gross Unrealized Losses 55 75
Total available for sale securities 579 638
Non-agency commercial mortgage-backed securities    
Available for sale securities    
Amortized Cost 123 473
Gross Unrealized Gains 0 0
Gross Unrealized Losses 14 23
Total available for sale securities 109 450
Certificates of deposit    
Available for sale securities    
Amortized Cost 100 2,245
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 14
Total available for sale securities 100 2,231
Other    
Available for sale securities    
Amortized Cost 22 323
Gross Unrealized Gains 0 0
Gross Unrealized Losses 3 8
Total available for sale securities $ 19 $ 315
Federal Family Education Loan Program Asset-Backed Securities | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration risk percentage 61.00% 57.00%
Collateralized Credit Card Securities | Asset-backed securities | Financial Instrument Concentration Risk    
Held to maturity securities    
Concentration risk percentage 24.00% 18.00%
Corporate Debt Securities Issued By Financial Services Industry    
Held to maturity securities    
AFS securities percentage 36.00% 37.00%
Commercial paper | Cash and Cash Equivalents    
Available for sale securities    
Total available for sale securities $ 0 $ 48
[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.