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Derivative and Hedging Activities - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Assets
Net gain on loan sales and securitizations	$ 5,000,000	$ 5,000,000	$ 24,000,000	$ 43,000,000
Fee income	23,000,000	42,000,000	67,000,000	117,000,000
Net return on mortgage servicing rights	0	(34,000,000)	0	(74,000,000)
Derivatives designated as hedging instruments: \| Interest rate swaps \| Other Assets \| Fair Value Hedging
Assets
Notional Amount	2,993,000,000		2,993,000,000		$ 0
Fair Value	0		0		0
Derivatives designated as hedging instruments: \| Interest rate swaps \| Other Assets \| Cash Flow Hedging
Assets
Notional Amount	2,000,000,000		2,000,000,000		0
Fair Value	0		0		0
Derivatives designated as hedging instruments: \| Interest rate swaps \| Other Liabilities \| Fair Value Hedging
Assets
Fair Value	0		0		0
Derivatives designated as hedging instruments: \| Interest rate swaps \| Other Liabilities \| Cash Flow Hedging
Assets
Fair Value	0		0		0
Derivatives not designated as hedging instruments: \| Interest rate swaps
Assets
Fee income	0		0
Net return on mortgage servicing rights		45,000,000		0
Derivatives not designated as hedging instruments: \| Interest rate swaps \| Other Assets
Assets
Notional Amount	3,843,000,000		3,843,000,000		3,323,000,000
Fair Value	20,000,000		20,000,000		15,000,000
Derivatives not designated as hedging instruments: \| Interest rate swaps \| Other Liabilities
Assets
Fair Value	21,000,000		21,000,000		30,000,000
Derivatives not designated as hedging instruments: \| Rate lock commitments \| Other Assets
Assets
Notional Amount	345,000,000		345,000,000		563,000,000
Fair Value	3,000,000		3,000,000		3,000,000
Derivatives not designated as hedging instruments: \| Rate lock commitments \| Other Liabilities
Assets
Fair Value	0		0		3,000,000
Derivatives not designated as hedging instruments: \| Mortgage-backed securities forwards
Assets
Net gain on loan sales and securitizations	0	$ 0	0	$ 20,000,000
Derivatives not designated as hedging instruments: \| Mortgage-backed securities forwards \| Other Assets
Assets
Notional Amount	211,000,000		211,000,000		344,000,000
Fair Value	0		0		7,000,000
Derivatives not designated as hedging instruments: \| Mortgage-backed securities forwards \| Other Liabilities
Assets
Fair Value	$ 1,000,000		$ 1,000,000		$ 2,000,000