Fair Value Accounting - Schedule of Assets and Liabilities Measured at Estimated Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Assets
Total securities available for sale	$ 16,939	$ 6,567
Mortgage loans held for sale	46	0
U.S. Treasury securities
Assets
Total securities available for sale	2,723	1,586
U.S. Government agency securities
Assets
Total securities available for sale	192	195
Mortgage-backed securities
Assets
Total securities available for sale	12,338	2,794
State and municipal securities
Assets
Total securities available for sale	1,407	1,709
Corporate notes and other
Assets
Total securities available for sale	279
Fair Value, Measurements, Recurring Basis
Assets
Total trading securities	5	0
Total securities available for sale	16,939	6,567
Other investments	320	253
Mutual funds held in rabbi trusts	93	13
Derivative assets	202	210
Liabilities
Mutual funds held in rabbi trusts	87	7
Derivative liabilities	146	80
Fair Value, Measurements, Recurring Basis \| U.S. Treasury securities
Assets
Total trading securities	2	0
Total securities available for sale	2,723	1,586
Fair Value, Measurements, Recurring Basis \| Asset-backed securities
Assets
Total trading securities	3	0
Fair Value, Measurements, Recurring Basis \| U.S. Government agency securities
Assets
Total securities available for sale	192	195
Fair Value, Measurements, Recurring Basis \| Mortgage-backed securities
Assets
Total securities available for sale	12,338	2,794
Fair Value, Measurements, Recurring Basis \| State and municipal securities
Assets
Total securities available for sale	1,407	1,709
Fair Value, Measurements, Recurring Basis \| Corporate notes and other
Assets
Total securities available for sale	279	283
Fair Value, Measurements, Recurring Basis \| Level 1
Assets
Total trading securities	2	0
Total securities available for sale	2,723	1,586
Mortgage loans held for sale	0	0
Other investments	0	0
Mutual funds held in rabbi trusts	93	13
Derivative assets	0	0
Liabilities
Mutual funds held in rabbi trusts	87	7
Derivative liabilities	0	0
Fair Value, Measurements, Recurring Basis \| Level 1 \| U.S. Treasury securities
Assets
Total trading securities	2	0
Total securities available for sale	2,723	1,586
Fair Value, Measurements, Recurring Basis \| Level 1 \| Asset-backed securities
Assets
Total trading securities	0	0
Fair Value, Measurements, Recurring Basis \| Level 1 \| U.S. Government agency securities
Assets
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 1 \| Mortgage-backed securities
Assets
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 1 \| State and municipal securities
Assets
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 1 \| Corporate notes and other
Assets
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 2
Assets
Total trading securities	3	0
Total securities available for sale	14,216	4,981
Mortgage loans held for sale	46	0
Other investments	38	23
Mutual funds held in rabbi trusts	0	0
Derivative assets	202	210
Liabilities
Mutual funds held in rabbi trusts	0	0
Derivative liabilities	146	80
Fair Value, Measurements, Recurring Basis \| Level 2 \| U.S. Treasury securities
Assets
Total trading securities	0	0
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 2 \| Asset-backed securities
Assets
Total trading securities	3	0
Fair Value, Measurements, Recurring Basis \| Level 2 \| U.S. Government agency securities
Assets
Total securities available for sale	192	195
Fair Value, Measurements, Recurring Basis \| Level 2 \| Mortgage-backed securities
Assets
Total securities available for sale	12,338	2,794
Fair Value, Measurements, Recurring Basis \| Level 2 \| State and municipal securities
Assets
Total securities available for sale	1,407	1,709
Fair Value, Measurements, Recurring Basis \| Level 2 \| Corporate notes and other
Assets
Total securities available for sale	279	283
Fair Value, Measurements, Recurring Basis \| Level 3
Assets
Total trading securities	0	0
Total securities available for sale	0	0
Mortgage loans held for sale	0	0
Other investments	282	230
Mutual funds held in rabbi trusts	0	0
Derivative assets	0	0
Liabilities
Mutual funds held in rabbi trusts	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring Basis \| Level 3 \| U.S. Treasury securities
Assets
Total trading securities	0	0
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 3 \| Asset-backed securities
Assets
Total trading securities	0	0
Fair Value, Measurements, Recurring Basis \| Level 3 \| U.S. Government agency securities
Assets
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 3 \| Mortgage-backed securities
Assets
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 3 \| State and municipal securities
Assets
Total securities available for sale	0	0
Fair Value, Measurements, Recurring Basis \| Level 3 \| Corporate notes and other
Assets
Total securities available for sale	$ 0	$ 0

Mutual Funds And Mutual Funds Held In Rabbi Trusts In Liability

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value portion of mortgage loans held-for-sale.

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Amount of investments classified as other.

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