v3.26.1
Derivative Instruments and Hedging Activities - Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged liability, fair value hedge $ 3,413 $ 3,378
Hedged Liability, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-term debt
Balance Sheet Location [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged asset, fair value hedge $ 14,660 $ 15,240
Hedged asset, fair value hedge, cumulative increase (decrease) $ (155) $ 7
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Available-for-sale securities (amortized cost basis of $26,222 and $25,825) Available-for-sale securities (amortized cost basis of $26,222 and $25,825)
Closed portfolio and beneficial interest, last-of-layer, amortized cost $ 13,200 $ 13,700
Amortized cost 12,900 13,400
Cumulative basis adjustment for active hedges, asset (liability) (146) (8)
Hedged asset, last-of-layer, amount 10,300 11,000
Balance Sheet Location [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest | Total derivatives designated as accounting hedges    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Cumulative basis adjustment for active hedges, asset (liability) (99) 46
Balance Sheet Location [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged asset, fair value hedge 20,461 27,808
Hedged asset, fair value hedge, cumulative increase (decrease) $ (33) $ 7
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Finance receivables and loans, net Finance receivables and loans, net
Cumulative basis adjustment for active hedges, asset (liability) $ (33) $ 7
Hedged asset, last-of-layer, amount 9,300 10,800
Closed portfolio, carrying value 16,500 21,800
Balance Sheet Location [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss | Total derivatives designated as accounting hedges    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Cumulative basis adjustment for active hedges, asset (liability) (34) 6
Balance Sheet Location [Axis]: us-gaap:LongTermDebt    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged liability, fair value hedge, cumulative increase (decrease) 74 79
Discontinued hedge | Balance Sheet Location [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) (48) (54)
Cumulative basis adjustment for active hedges, asset (liability) (47) (54)
Discontinued hedge | Balance Sheet Location [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) 1 1
Cumulative basis adjustment for active hedges, asset (liability) 1 1
Discontinued hedge | Balance Sheet Location [Axis]: us-gaap:LongTermDebt    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged liability, discontinued fair value hedge, cumulative increase (decrease) $ 74 $ 79