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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Derivative Instruments and Hedging Activities - Schedule of Estimated Fair Value of Derivative Instruments included in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025	Dec. 22, 2025	Jun. 28, 2024
Designated as Hedging Instrument
Derivative [Line Items]
Estimated fair value of derivative assets	$ 74	$ 130
Estimated fair value of derivative liabilities	7	1
Not Designated as Hedging Instruments
Derivative [Line Items]
Estimated fair value of derivative assets	169	41
Estimated fair value of derivative liabilities	360	40
Cash Flow Hedges
Derivative [Line Items]
Estimated fair value of derivative assets	70	83
Estimated fair value of derivative liabilities	0	0
Fair Value Hedges
Derivative [Line Items]
Estimated fair value of derivative assets	4	47
Estimated fair value of derivative liabilities	7	1
Interest rate contracts \| Not Designated as Hedging Instruments
Derivative [Line Items]
Notional Amount	29,284	6,425
Estimated fair value of derivative assets	164	40
Estimated fair value of derivative liabilities	357	40
Interest rate contracts \| Cash Flow Hedges
Derivative [Line Items]
Notional Amount	10,250	9,750
Estimated fair value of derivative assets	70	83
Estimated fair value of derivative liabilities	0	0
Interest rate contracts \| Fair Value Hedges
Derivative [Line Items]
Notional Amount	6,499	4,340
Estimated fair value of derivative assets	4	47
Estimated fair value of derivative liabilities	7	1
Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans \| Not Designated as Hedging Instruments \| Mortgage derivatives - interest rate lock commitments
Derivative [Line Items]
Notional Amount	109	64
Estimated fair value of derivative assets	1	1
Estimated fair value of derivative liabilities	0	0
Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans \| Not Designated as Hedging Instruments \| Mortgage derivatives - forward commitments to sell fixed-rate mortgage loans
Derivative [Line Items]
Notional Amount	105	53
Estimated fair value of derivative assets	2	0
Estimated fair value of derivative liabilities	0	0
Foreign exchange contracts \| Not Designated as Hedging Instruments
Derivative [Line Items]
Notional Amount	178	0
Estimated fair value of derivative assets	2	0
Estimated fair value of derivative liabilities	0	0
Visa derivative \| Not Designated as Hedging Instruments
Derivative [Line Items]
Notional Amount	0	0
Estimated fair value of derivative assets	0	0
Estimated fair value of derivative liabilities	3	0
Credit default swap \| Not Designated as Hedging Instruments
Derivative [Line Items]
Notional Amount	146	153	$ 80	$ 87
Estimated fair value of derivative assets	0	0
Estimated fair value of derivative liabilities	$ 0	$ 0