v3.25.2
Securities - Gross Unrealized Losses and Related Fair Values (Detail)
$ in Millions
Jun. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of securities available for sale in one year or less | security 37 40
Securities available-for-sale gross unrealized losses one year or less $ (24) $ (45)
Securities available-for-sale aggregate fair value of investment one year or less $ 6,074 $ 6,462
Number of Securities available for sale greater than one year | security 327 319
Securities available-for-sale gross unrealized losses greater than one year $ (2,013) $ (2,253)
Securities available-for-sale aggregate fair value of investment greater than one year $ 17,000 $ 14,384
U.S. Treasury    
Debt Securities, Available-for-sale [Line Items]    
Number of securities available for sale in one year or less | security 8 14
Securities available-for-sale gross unrealized losses one year or less $ (5) $ (15)
Securities available-for-sale aggregate fair value of investment one year or less $ 2,741 $ 3,402
Number of Securities available for sale greater than one year | security 49 38
Securities available-for-sale gross unrealized losses greater than one year $ (211) $ (190)
Securities available-for-sale aggregate fair value of investment greater than one year $ 6,946 $ 4,055
U.S. Government sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Number of securities available for sale in one year or less | security 1 0
Securities available-for-sale gross unrealized losses one year or less $ 0 $ 0
Securities available-for-sale aggregate fair value of investment one year or less $ 0 $ 0
Number of Securities available for sale greater than one year | security 134 137
Securities available-for-sale gross unrealized losses greater than one year $ (913) $ (1,008)
Securities available-for-sale aggregate fair value of investment greater than one year $ 3,693 $ 3,871
U.S. Government agency issued or guaranteed    
Debt Securities, Available-for-sale [Line Items]    
Number of securities available for sale in one year or less | security 6 4
Securities available-for-sale gross unrealized losses one year or less $ (18) $ (28)
Securities available-for-sale aggregate fair value of investment one year or less $ 943 $ 526
Number of Securities available for sale greater than one year | security 136 137
Securities available-for-sale gross unrealized losses greater than one year $ (879) $ (1,043)
Securities available-for-sale aggregate fair value of investment greater than one year $ 6,121 $ 6,311
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities available for sale in one year or less | security 2 0
Securities available-for-sale gross unrealized losses one year or less $ 0 $ 0
Securities available-for-sale aggregate fair value of investment one year or less $ 129 $ 0
Number of Securities available for sale greater than one year | security 6 6
Securities available-for-sale gross unrealized losses greater than one year $ (10) $ (12)
Securities available-for-sale aggregate fair value of investment greater than one year $ 92 $ 97
Foreign debt securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities available for sale in one year or less | security 20 22
Securities available-for-sale gross unrealized losses one year or less $ (1) $ (2)
Securities available-for-sale aggregate fair value of investment one year or less $ 2,261 $ 2,534
Number of Securities available for sale greater than one year | security 2 1
Securities available-for-sale gross unrealized losses greater than one year $ 0 $ 0
Securities available-for-sale aggregate fair value of investment greater than one year $ 148 $ 50