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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, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Earnings before income taxes (“EBT”)	$ 229		$ 219	$ 804	$ 738
Income taxes at statutory rate	48		46	169	155
Effect of ESOP dividend paid deduction	(1)		0	(3)	(3)
Effect of tax exempt interest	(1)		(2)	(3)	(4)
Effect of stock-based compensation	0		0	(2)	(2)
Effect of the change in valuation allowance	(2)		(2)	(2)	(2)
Effect of dividends received deduction	0		0	(1)	(1)
Effect of nondeductible expenses	2		3	6	8
Effect of adjustment related to sale of subsidiary	0	$ 4	0	4	0
Effect of prior year income taxes	1		(5)	1	(5)
Effect of foreign operations	1		2	1	6
Effect of other income	0		0	2	(3)
Provision for income taxes	$ 48		$ 42	$ 172	$ 149
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 ESOP dividend paid deduction as a percentage of EBT	0.00%		0.00%	(1.00%)	0.00%
Effect of tax exempt interest as a percentage of EBT	0.00%		(1.00%)	(1.00%)	(1.00%)
Effect of stock-based compensation as a percentage of EBT	0.00%		0.00%	0.00%	0.00%
Effect of the change in valuation allowance, as a percentage of EBT	(1.00%)		(1.00%)	0.00%	0.00%
Effect of dividends received deduction 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%	0.00%
Effect of prior year income taxes as a percentage of EBT	0.00%		(2.00%)	0.00%	(1.00%)
Effect of foreign operations as a percentage of EBT	0.00%		1.00%	0.00%	1.00%
Effect of other income tax reconciliation as a percentage of EBT	0.00%		0.00%	0.00%	(1.00%)
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT	21.00%		19.00%	21.00%	20.00%

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