Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated loss to be reclassified from AOCI	$ 197
Designated as Hedging Instrument \| Interest rate swaps \| Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amounts	77,100	$ 18,700
Designated as Hedging Instrument \| Interest rate swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amounts	61,600	$ 42,200
Margin Loans \| Designated as Hedging Instrument \| Interest rate swaps \| Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amounts	43,600
Underlying principal	20,000
PALs \| Designated as Hedging Instrument \| Interest rate swaps \| Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amounts	33,500
Underlying principal	24,800
Senior Notes \| Designated as Hedging Instrument \| Interest rate swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amounts	50,300
Underlying principal	21,800
AFS securities \| Designated as Hedging Instrument \| Interest rate swaps \| Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amounts	11,300
Underlying principal	$ 11,300