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Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Variable Interest Entity [Line Items]
Aggregate assets	$ 458,936		$ 458,936		$ 479,843
Aggregate liabilities	409,485		409,485		431,468
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Amortization	47	$ 38	94	$ 80
Tax credits and other tax benefits	65	$ 49	126	$ 102
Aggregate assets	2,094		2,094		1,953
Aggregate liabilities	991		991		947
Maximum exposure to loss	2,188		2,188		2,069
Variable Interest Entity, Not Primary Beneficiary | LIHTC Investments
Variable Interest Entity [Line Items]
Aggregate assets	1,845		1,845		1,729
Aggregate liabilities	991		991		947
Maximum exposure to loss	1,845		1,845		1,729
Variable Interest Entity, Not Primary Beneficiary | Other investments
Variable Interest Entity [Line Items]
Aggregate assets	249		249		224
Aggregate liabilities	0		0		0
Maximum exposure to loss	$ 343		$ 343		$ 340

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Amount, before amortization expense, of income tax credit and other tax benefit generated by investment under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method.

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