Investment Securities - Schedule of Investment Portfolio (Details) - USD ($)	9 Months Ended
Sep. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Available-for-sale securities
Amortized cost	$ 25,660,000,000		$ 26,810,000,000
Gross unrealized gains	67,000,000		5,000,000
Gross unrealized losses	(3,043,000,000)		(4,405,000,000)
Fair value	22,684,000,000		22,410,000,000
Held-to-maturity securities
Amortized cost	4,433,000,000		4,346,000,000
Gross unrealized gains	223,000,000		143,000,000
Gross unrealized losses	(163,000,000)		(196,000,000)
Fair value	4,493,000,000		4,293,000,000
Debt securities, available-for-sale, accrued interest receivable	$ 81,000,000		$ 73,000,000
Debt securities, available-for-sale, accrued interest, after allowance for credit loss, statement of financial position [extensible enumeration]	Other assets		Other assets
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest	$ 0		$ 0
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest	0		0
Debt securities, held-to-maturity, accrued interest receivable	13,000,000		12,000,000
Amortized cost basis in amount sold		$ 4,600,000,000
Gross proceeds received and receivable from sale of lower-yielding available-for-sale securities	4,100,000,000
Pre-tax loss	495,000,000
Operating Segments \| Insurance operations
Held-to-maturity securities
Deposited securities	13,000,000		13,000,000
Asset Pledged as Collateral with Right
Available-for-sale securities
Fair value	3,700,000,000		3,400,000,000
Held-to-maturity securities
Securities with the right to sell or pledge	945,000,000		439,000,000
Asset Pledged as Collateral with Right \| Federal Home Loan Bank advances
Held-to-maturity securities
Securities with the right to sell or pledge	2,800,000,000		2,900,000,000
U.S. Treasury and federal agencies
Available-for-sale securities
Amortized cost	2,230,000,000		2,073,000,000
Gross unrealized gains	19,000,000		0
Gross unrealized losses	(55,000,000)		(200,000,000)
Fair value	2,194,000,000		1,873,000,000
U.S. States and political subdivisions
Available-for-sale securities
Amortized cost	634,000,000		704,000,000
Gross unrealized gains	0		0
Gross unrealized losses	(80,000,000)		(87,000,000)
Fair value	554,000,000		617,000,000
Foreign government
Available-for-sale securities
Amortized cost	205,000,000		198,000,000
Gross unrealized gains	2,000,000		1,000,000
Gross unrealized losses	(3,000,000)		(5,000,000)
Fair value	204,000,000		194,000,000
Agency mortgage-backed residential
Available-for-sale securities
Amortized cost	14,965,000,000		16,765,000,000
Gross unrealized gains	12,000,000		0
Gross unrealized losses	(2,155,000,000)		(3,112,000,000)
Fair value	12,822,000,000		13,653,000,000
Held-to-maturity securities
Amortized cost	1,284,000,000		935,000,000
Gross unrealized gains	5,000,000		0
Gross unrealized losses	(163,000,000)		(196,000,000)
Fair value	1,126,000,000		739,000,000
Hedged asset, fair value hedge, cumulative increase (decrease)	53,000,000
Hedged liability, fair value hedge, cumulative increase (decrease)			72,000,000
Mortgage-backed residential
Available-for-sale securities
Amortized cost	235,000,000		249,000,000
Gross unrealized gains	0		0
Gross unrealized losses	(35,000,000)		(43,000,000)
Fair value	200,000,000		206,000,000
Held-to-maturity securities
Amortized cost	3,091,000,000		3,323,000,000
Gross unrealized gains	217,000,000		142,000,000
Gross unrealized losses	0		0
Fair value	3,308,000,000		3,465,000,000
Agency mortgage-backed commercial
Available-for-sale securities
Amortized cost	5,415,000,000		4,819,000,000
Gross unrealized gains	14,000,000		1,000,000
Gross unrealized losses	(647,000,000)		(836,000,000)
Fair value	4,782,000,000		3,984,000,000
Held-to-maturity securities
Hedged asset, fair value hedge, cumulative increase (decrease)	40,000,000
Hedged liability, fair value hedge, cumulative increase (decrease)			34,000,000
Asset-backed
Available-for-sale securities
Amortized cost	25,000,000		131,000,000
Gross unrealized gains	0		0
Gross unrealized losses	0		(2,000,000)
Fair value	25,000,000		129,000,000
Held-to-maturity securities
Amortized cost	58,000,000		88,000,000
Gross unrealized gains	1,000,000		1,000,000
Gross unrealized losses	0		0
Fair value	59,000,000		89,000,000
Corporate debt
Available-for-sale securities
Amortized cost	1,951,000,000		1,871,000,000
Gross unrealized gains	20,000,000		3,000,000
Gross unrealized losses	(68,000,000)		(120,000,000)
Fair value	$ 1,903,000,000		$ 1,754,000,000

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

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