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Derivative and Hedging Activities and Restricted Cash - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivatives designated as hedging instruments: | Interest rate swaps | Other Assets
Derivative Asset [Abstract]
Notional Amount	$ 993
Fair Value	0
Derivatives designated as hedging instruments: | Interest rate swaps | Other Liabilities
Derivative Asset [Abstract]
Fair Value	0
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Assets
Derivative Asset [Abstract]
Notional Amount	3,234	$ 3,323
Fair Value	15	15
Derivatives not designated as hedging instruments: | Interest rate swaps | Other Liabilities
Derivative Asset [Abstract]
Fair Value	23	30
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Assets
Derivative Asset [Abstract]
Notional Amount	547	563
Fair Value	4	3
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Liabilities
Derivative Asset [Abstract]
Fair Value	3	3
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Assets
Derivative Asset [Abstract]
Notional Amount	281	344
Fair Value	0	7
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Liabilities
Derivative Asset [Abstract]
Fair Value	$ 3	$ 2

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

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- Definition

Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

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