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CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest $ 37,000,000 $ 24,000,000
Amortized cost 46,480,000,000 13,281,000,000
Accumulated depreciation 255,000,000 320,000,000
Property and equipment accumulated depreciation 340,000,000 333,000,000
Intangible assets accumulated amortization $ 15,000,000 $ 2,000,000
Preferred stock, shares outstanding (in shares) 12,000 0
Preferred stock, Series A; par value $1 per share; $25,000 per share liquidation preference; 20,000 shares authorized; issued and outstanding: 2024 - 16,000 shares 2023 - no shares    
Preferred stock, par value (in usd per share) $ 1 $ 1
Preferred shares authorized (in shares) 20,000 20,000
Preferred stock issued (in shares) 16,000 0
Preferred stock, shares outstanding (in shares) 16,000 0
Preferred stock, Series B; par value $1 per share; $25,000 per share liquidation preference; 12,000 shares authorized; issued and outstanding: 2024 - 12,000 shares 2023 - no shares    
Preferred stock, par value (in usd per share) $ 1 $ 1
Preferred shares authorized (in shares) 12,000 12,000
Preferred stock issued (in shares) 12,000 0