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Income Taxes - Reconciliation of income taxes at the statutory rate to the provision for income taxes (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Earnings before income taxes (“EBT”)	$ 268		$ 229		$ 694	$ 804
Income taxes at statutory rate	57		48		146	169
Effect of the change in valuation allowance	(6)		(2)		(6)	(2)
Effect of prior year income taxes	(5)		1		(5)	1
Effect of tax exempt interest	(1)		(1)		(3)	(3)
Effect of ESOP dividend paid deduction	0		(1)		(2)	(3)
Effect of dividends received deduction	(1)		0		(2)	(1)
Effect of stock-based compensation	0		0		(1)	(2)
Effect of nondeductible expenses	3		2		9	6
Effect of adjustment related to sale of subsidiary	0	$ 7	0	$ 4	7	4
Effect of foreign operations	1		1		4	1
Effect of other income	5		0		4	2
Provision for income taxes	$ 53		$ 48		$ 151	$ 172
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income taxes at statutory rate as a percentage of EBT	21.00%		21.00%		21.00%	21.00%
Effect of the change in valuation allowance, as a percentage of EBT	(2.00%)		(1.00%)		(1.00%)	0.00%
Effect of prior year income taxes as a percentage of EBT	(2.00%)		0.00%		(1.00%)	0.00%
Effect of tax exempt interest as a percentage of EBT	0.00%		0.00%		0.00%	(1.00%)
Effect of ESOP dividend paid deduction as a percentage of EBT	0.00%		0.00%		0.00%	(1.00%)
Effect of dividends received deduction as a percentage of EBT	0.00%		0.00%		0.00%	0.00%
Effect of stock-based compensation as a percentage of EBT	0.00%		0.00%		0.00%	0.00%
Effect of nondeductible expenses as a percentage of EBT	1.00%		1.00%		1.00%	1.00%
Effect of adjustment related to sale of subsidiary as a percentage of EBT	0.00%		0.00%		1.00%	1.00%
Effect of foreign operations as a percentage of EBT	0.00%		0.00%		1.00%	0.00%
Effect of other income tax reconciliation as a percentage of EBT	2.00%		0.00%		0.00%	0.00%
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT	20.00%		21.00%		22.00%	21.00%

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